Asbestos Gravel in Burgenland: Facts, Finds and Open Questions

What happened?

On 2 January 2026, four quarries in southern Burgenland (Pilgersdorf, Bernstein, Postmann [postal Rumpersdorf, cadastral municipality Glashütten bei Schlaining] and Badersdorf) were closed by the Austrian authorities. The reason: official material samples from November 2025 found quarry-specific asbestos contents of 2 to 100 percent in the extracted serpentinite. The legal basis for the closures was § 175 of the Mineral Raw Materials Act ("imminent danger"), ordered by the responsible district authorities (Bezirkshauptmannschaften).

At the same time, the regulation was tightened: on 31 December 2025 the GKV amendment (BGBl. II No. 339/2025, transposing EU Directive 2023/2668) took effect and lowered the Austrian workplace limit for asbestos fibres from 100,000 to 10,000 fibres per cubic metre of air (second step 2,000 F/m³ from 21 December 2029; Schumann, 4053/AB-BR/2026, question 18). The closures themselves, however, did not rest on this workplace value but on § 175 of the Mineral Raw Materials Act ("imminent danger") and on the asbestos finding from official material samples taken in November 2025; according to Greenpeace, these samples were "commissioned by the authorities in the course of an EU directive" (5min.at, 2.1.2026; Greenpeace factsheet, 23.1.2026). The widespread account that it was the lowering of the limit that first made extraction impermissible and thereby triggered the closures therefore does not match the documented reason for closure.

The weekly newspaper Falter published a multi-page investigation into the 30-year backstory in its issue 13/2026 (24 March 2026, authors: Jürgen Klatzer and Matthias Winterer). Authorities, experts and operators had known about the asbestos problem since the 1990s; action was taken only now. Since January 2026, Greenpeace Austria has been documenting, in its own sampling campaign, where installed material from these quarries can be found. The finds now range from Burgenland and Lower Austria through Styria to Western Hungary, with a Hungarian focus in the Oladi-plató residential area in Szombathely.

The case has since widened: up to 30 Western Hungarian localities are affected according to the Mayor of Szombathely (Dr. András Nemény, Kontroll.hu interview early May 2026); a specific officially confirmed itemised list is pending. In Hungary a government decree on the clean-up was issued, Greenpeace calls on the Austrian federal government to set up a crisis task force. The Montanuniversität Leoben expert report on the four closed quarries was transmitted to the district administrative authorities on 8 May 2026; the results themselves are not public until the proceedings conclude.

The four closed quarries

According to Falter's investigations (Klatzer/Winterer, Falter 13/2026) and the official federal table (BMLUK 4055/AB-BR/2026), the confirmed contaminated batches come from four quarries in southern Burgenland. All four extracted serpentinite from the geological context of the so-called Rechnitz Window.

• Pilgersdorf (Oberpullendorf district): one of the largest extraction sites in the region, encumbered since 2011 by an environmental impact assessment procedure against which the then operator filed an objection. Products: road grit, chippings, construction sand.
• Bernstein (Oberwart district): subject of an asbestos measurement by the ZFE Graz as early as 1994. Products: road grit, track ballast; locally the contents reach almost pure asbestos-fibre veins.
• Postmann (Oberwart district, cadastral municipality Glashütten bei Schlaining, postal "Rumpersdorf, 7463 Weiden bei Rechnitz"): in 2008 the 25-kilogram bag of road grit that the then federal minister had recalled by official order came from this quarry. Products: road grit, winter grit granulate. In the media the quarry is referred to partly as "Rumpersdorf", partly as "Glashütten bei Schlaining". The same site under mining law is meant.
• Badersdorf (Oberwart district): became publicly known in 2026 through a documented case along a private garden fence, where dust-tape measurements found 280 fibres per cm², against the threshold of 100 a reference value for acute need for action.

All four quarries were officially closed on 2 January 2026. Falter's investigation names the operator details in full; we limit ourselves to the publicly undisputed attribution and refer to the linked original source for names.

→ Report a find

The material from the four quarries was installed on a large scale over three decades. Falter speaks of roughly 50 million tonnes since 1990; Greenpeace's cost calculation (1.6 billion euros) is based on around 26 million tonnes of asbestos-bearing rock. The most comprehensive public collection of find locations is maintained by Greenpeace Austria: a continuously expanded interactive map (as of 1 July 2026: 109 georeferenced points, of which 65 lab-confirmed, 23 citizen-reported, 5 quarries, 16 remediated areas; greenpeace.at). The following list draws on finds by Greenpeace Austria, official confirmations, reports from ORF Burgenland, ORF Lower Austria, BVZ and Hungarian media (Telex, Index, vaol.hu, kormanyhivatalok.hu); it combines editorially curated finds with correspondingly labelled, unconfirmed reports from the public and is updated continuously.

New reports (July and August 2026)

Vienna (24 July 2026): The original six affected streets have become 40 suspected cases; suspected cases are cases under examination, not findings. The City of Vienna took its own samples at the reported sites and had them tested by an accredited testing institution; for five streets the suspicion is thus lab-confirmed. This confirmation is public; the reporting names no content or fibre value. Confirmed, per the report, are Rosenhügelstraße, Anton-Freunschlag-Gasse, Bertegasse, Wernergasse and Stieglergasse; the locations table above will be brought in line once the affected rows are matched to the confirmed streets. MA 28 announced that the confirmed surfaces would be sealed with a sealing layer as quickly as possible, in any case within the summer (wien.ORF.at, 24 July 2026).

Tourist destinations (28 July 2026): Greenpeace reported laboratory analyses with asbestos contents of up to 50 percent in gravel and sand samples from several well-known destinations, including surfaces at Burg Schlaining (car park, inner courtyards) and at the Burgsee in front of the Geschriebenstein lookout; two nearby hiking trails are said to be particularly affected. Burg Lockenhaus is also named. The leisure company concerned (not named by ORF) and the owners of Burg Lockenhaus plan, according to ORF, to close off and wet affected areas (ORF Burgenland, 28 July 2026).

For Burg Schlaining, which is owned by the province, the reaction differed: the Landesholding, to which the provincial real-estate company and thus the castle belong, stated that it could not comment on the quality and nature of the Greenpeace sampling; the known measured values showed no exceedance of legal limits, so there was accordingly no hazard; which limits are meant is not spelled out in the report (→ Reference values). The province's taskforce criticised the quality of the Greenpeace sampling and recommended standard-compliant sampling (ORF Burgenland, 28 July 2026). On 4 August 2026, Landesimmobilien Burgenland reported that a specialist firm it had commissioned found no asbestos contamination at Burg Schlaining: the materials used there posed "no health hazard", the paths and squares could be "entered and used without concern"; the results published by Greenpeace rested "on non-traceable and non-standard-compliant samplings" (ORF Burgenland, 4 August 2026).

The two statements stand against each other: Greenpeace reports asbestos in samples from surfaces of Burg Schlaining, while the specialist firm commissioned by Landesimmobilien found no asbestos contamination at Burg Schlaining. The Greenpeace samples come, according to ORF, from the car park and the inner courtyards, the firm's finding covers the paths and squares; whether these refer to the same surfaces cannot be determined from the reporting. Neither of the two underlying reports is available to us, and neither side makes a statement about their publication; both findings are therefore not independently verifiable for us. The provincial side's criticism targets the sampling, not the laboratory method. We do not adjudicate this dispute.

Bad Tatzmannsdorf (5 August 2026): Greenpeace reported high asbestos contamination in the spa town: spot samples on eight public surfaces, in gravel as well as on asphalted surfaces; named are, among others, the carriageways of the residential streets Sepp-Rehling-Gasse and Baron-Toth-Gasse and a building site next to the outdoor pool. A mixed sample of fine gravel and sand from a car park in the town centre contains, according to the test report, both chrysotile and amphibole asbestos; this test report is not available to us, and the reporting makes no statement about its publication. The combination of the two asbestos types is no indication of a particular origin: the BMLUK table (4055/AB-BR/2026) reports the same mineral profile for two of the four closed quarries. The affected surfaces belong partly to the municipality, partly to the spa centre, partly to private owners. According to Greenpeace, Mayor Stefan Laimer has already taken measures: the municipal areas are being secured, closed off and remediated, or remediation has been promised; the province-owned spa centre "Reduce" has also taken steps. The reporting contains no confirmation by the municipality itself (Kurier, 5 August 2026).

At two province-owned sites, the reactions thus differed: at Bad Tatzmannsdorf the province-owned spa centre has, according to Greenpeace, taken steps, while at province-owned Burg Schlaining the owner's side disputes any contamination.

Remediation status outside Burgenland and a Kaisersdorf addendum

The Greenpeace analysis on gravel surfaces, May 2026 (full title: „Greenpeace-Analyse: Asbest auf österreichischen Schotterstraßen und Schotter-Parkplätzen"; → Sources), reports different things for Lower Austria, and the differences are the point: it lists the gravel roads of the province-owned Lower Austrian tourism operations as already remediated, as well as an unnamed gravel road in a Lower Austrian ski area, remediated even before Greenpeace received the laboratory result. For Aspangberg-St. Peter, by contrast, the table records a commissioned remediation, and the mayor told Greenpeace by telephone that the road would be remediated: a promise, not a completed remediation. Whether the ski-area road belongs to the tourism operations is not resolved by the document, and the Greenpeace press release of 13 May 2026 attributes the remediation before receipt of the laboratory result to the tourism operations; the two documents do not line up here, which is why we give no number. All of these statements rest on Greenpeace alone, without confirmation by the province concerned or the owners; laboratory reports for these sites are not available to us, and the analysis makes no statement about their publication.

Kaisersdorf (Oberpullendorf district): The same Greenpeace analysis on gravel surfaces, May 2026, also contains one Burgenland datum, which we carry here because this document is its source: a local resident, it reports, sent a sample of the gravel material to a laboratory and shared the lab report with Greenpeace; the asbestos content is above 50 percent. We do not hold the lab report, and the Greenpeace analysis on gravel surfaces, May 2026, says nothing about its publication; the figure is therefore not independently verifiable for us.

The toxicological relevance of asbestos-bearing gravel in public space can currently be assessed most precisely from the case of the Oladi-plató residential estate in Szombathely. While the Burgenland taskforce conducted its first measurement series exclusively under wet, cold winter conditions (conditions that bind asbestos fibres to the ground), airborne-fibre measurements under dry conditions with real traffic loading are available from Hungary.

The case has since widened. In early May 2026, Mayor András Nemény stated in an interview with Kontroll.hu that, besides Szombathely, Sopron, Kőszeg and up to 30 further localities may be affected by the contaminated gravel, predominantly in Vas county, with further indications pointing to Zala county and the Székesfehérvár region.

Burgenland vs. Szombathely compared

Key mineralogical finding

"In some of the quarries the gravel comes from, a second geological process also took place in the rock, as a result of which fibrous minerals of the amphibole group also formed. That is clearly very problematic: a many-times-proven carcinogen. The cancer risk of amphibole asbestos is a hundred times higher than that of chrysotile. On top of that, this second geological process also weakened the rock mechanically. When it is laid out it looks apparently intact, but when cars drive over it, it crumbles much more easily."

Prof. Tamás Weiszburg, Telex interview, 27 April 2026

The Burgenland taskforce's raw data confirm the mineralogical picture at the airborne-fibre level: the asbestos fibres predominantly detected at the 66 measurement points were amphiboles (actinolite, tremolite), not chrysotile. At the level of quarry-specific mineralogy, the federal table (4055/AB-BR/2026) lists amphiboles for two of the four quarries (Postmann and Badersdorf, each chrysotile + amphibole); for Pilgersdorf and Bernstein, only chrysotile is listed.

What Szombathely means for Austria

"If the gravel intended as a road sub-base had been closed off with the next layers, no one would know about it today and it would not be a particular problem. No one knows how many tens or hundreds of kilometres of closed asphalt sub-base built in the western counties over the past one or two decades is still asbestos-bearing. These are not dangerous now, but when the road is broken open, for repairs for instance, asbestos investigations will become necessary for the workers' health."

Prof. Tamás Weiszburg, Telex interview, 27 April 2026

The same applies by analogy to Lower Austria, Styria and Burgenland. Every repair on a road with an asbestos-bearing sub-base becomes asbestos remediation within the meaning of § 26 GKV, a question of regulation and of knowledge that the federal government is not currently addressing systematically. In parallel with the worker-protection remediation duty (§ 26 GKV), the waste-law track applies: openly lying, health-endangering material can, under the objective concept of waste, already be waste and must be disposed of as hazardous waste from 0.1 percent (→ Competence and effect).

How dangerous is the asbestos gravel really?

The assessment of the health hazard posed by the installed serpentinite gravel is publicly contested, and the differences are not rhetorical, they are substantive.

What the provincial taskforce measured

The provincial taskforce, under the physicians Hans-Peter Hutter and Hanns Moshammer (Medical University of Vienna), published the complete first measurement series on 25 March 2026. At all 66 measurement points in Burgenland, the asbestos-fibre concentration stayed below the reference value of 1,000 fibres/m³ chosen by the taskforce itself. At 58 measurement points the value was below 400 fibres/m³, at eight locations between 540 and 830 fibres/m³, highest value 829 F/m³ (Dornburggasse Oberwart, 14 amphibole and 2 chrysotile fibres).

Three methodological limitations are decisive:

First: the reference value of 1,000 F/m³ is not laid down in law. A binding limit for asbestos fibres in ambient air exists neither in Austria nor at EU level. The taskforce chose this value itself. The value of 1,000 F/m³ does exist in the German Asbestos Directive of 1996, but there as the statistical upper bound (95% confidence interval) to the actual clearance value of 500 F/m³ after completed remediation, or as a protection value for third parties during active remediation work. Not as a value for the permanent exposure of the population in the general living environment.

Second: all measurements were taken under wet, cold winter conditions (wet ground, snow, high humidity). These conditions bind fibres to the ground. The taskforce itself notes, in its annotations to the measurement series, that a one-off measurement under these conditions is "not yet a sufficient basis for a medical assessment" and that a second measurement series is required in summer.

Third: the taskforce expressly notes in the annotations to its own data that "values above the expected background loading give cause for action under the precautionary principle of public-health protection". This self-assessment was, however, not communicated prominently in the high-profile reassurance message of "no cause for concern".

What Greenpeace and toxicology add

Greenpeace Austria and the environmental toxicologist Dr. Norbert Weis consider the winter measurement series unrepresentative. The dust-tape measurements on the ground already show clear contamination: about 280 fibres per square centimetre in Badersdorf against a threshold of 100/cm², 170 fibres per square centimetre in Kirchschlag. For respirable asbestos fibres, the linear no-threshold principle applies under the WHO and in EU asbestos regulation: there is no safe threshold; every additional fibre raises the risk statistically.

The medical facts neither side disputes

• Chrysotile (serpentine asbestos) and amphibole asbestos (actinolite, tremolite) are both classified as category 1 carcinogens (IARC).
• Amphibole asbestos is considered significantly more dangerous than chrysotile; the order of magnitude of the difference is often given as roughly a hundredfold, particularly for mesothelioma. The fibres predominantly detected in Burgenland are amphiboles.
• Asbestos-related diseases (lung cancer, mesothelioma, asbestosis) have latency periods of 20 to 50 years. Anyone falling ill today was exposed in the 1980s or 1990s.
• The fibre shape makes asbestos dangerous: long, thin, biopersistent. Fibres are inhaled, remain in the lung and act there as a non-degradable foreign body.

Our assessment

The scientific data do not justify reassurance. The taskforce's winter measurements were taken under conditions that minimise fibre release. The Hungarian summer measurements on the same material show that under real conditions, values are reached that are many times the Austrian winter measurements and exceed the natural outdoor-air background by orders of magnitude. Combined with the mineralogical finding of amphibole asbestos, restraint in the use of sensitive areas (playgrounds, schools, kindergartens, hospitals) until clarification through summer measurements and assured remediation is the minimum standard, not the ceiling.

If so much asbestos is out there, why aren't we seeing more cases yet?

It's a common question. It assumes that a serious exposure ought to show up quickly in a wave of illness. With asbestos the opposite is true, and the reason is time.

Latency. Mesothelioma and asbestos-related lung cancer typically appear 20 to 50 years after exposure; in a documented series of 312 pleural mesotheliomas the span between first exposure and death ranged from 14 to 72 years, averaging about 49 (Bianchi et al. 1997). The serpentinite gravel was laid down over decades and in large quantities, including after the 1990 asbestos ban (see above). Anyone exposed in the 1990s or 2000s would only now be starting to fall ill; the larger part of any consequences would still lie ahead. That no wave is visible today is therefore not evidence of safety, but exactly what a delayed-acting exposure looks like at its start.

An Austrian comparison shows what that trajectory looks like. In the Görtschitztal (district of Sankt Veit an der Glan), asbestos was processed until 1977 (Wietersdorf cement works; ORF Kärnten and company history). The mesothelioma rate there did not fall afterwards but kept rising: in the eastern part of the district (age-standardised, per 100,000) from 2.8 to 12.1 by 2012, more than three decades after the exposure ended (Hutter et al., "Cancer incidence in an Austrian alpine valley 1983–2012", Wiener klinische Wochenschrift; the study dates the end of processing, without a source, to the late 1980s).

An existing elevation. Quite apart from the gravel, Burgenland is not a blank slate. In the cancer registry the southern-Burgenland districts of Oberwart (rate 4.7) and Oberpullendorf (4.5) sit, for 1990 to 2011, at roughly twice the Austrian average (2.1 per 10,000), and that without any asbestos-cement plant or comparable processing industry of the kind that marks the top districts of Vöcklabruck and Sankt Veit. These figures go back to exposures of the 1970s to 1990s; their exact cause (occupational, domestic or environmental) cannot be determined from the statistics alone. But the elevation is real, and it does not end with the 2011 reporting year (→ Austria's mesothelioma map).

The continuation bears this out. Across Austria the number of mesotheliomas did not fall after 2011 but stayed high: about 100 new cases a year, peaking in 2012 (124) and 2021 (122). For Burgenland itself the same register records 68 cases in the 22 years from 1990 to 2011 and 69 in the 13 years from 2012 to 2024, so more per year than before. These state-level counts are small and must be read with caution, because case ascertainment has grown more complete over time; but they point the same way as the district rates: no all-clear. The district-level continuation for Oberwart and Oberpullendorf is available only through a special extraction from the register and is still pending (Statistik Austria, Austrian National Cancer Registry, open data OGD_krebs_ext_KREBS_1).

This can be set against the predicted peak of asbestos-related mesothelioma, which the literature dates for Europe to roughly 2015 to 2025 (Austrian Mesothelioma Interest Group: Geltner et al. 2016 give 2015 to 2020, Klikovits et al. 2016 give 2020 to 2025). The Austrian figures fit that: a plateau around the peak, lately easing slightly. Burgenland is precisely not following that pattern. A region with no asbestos-processing industry of its own should, on the strength of the legacy alone, be declining rather than rising. With small numbers and improving ascertainment this is no proof, but it is not the picture of a past that is simply fading out.

That asbestos reached the non-occupational population of southern Burgenland through the environment early on has been documented since the 1970s: a screening study found pleural plaques in ten percent of the Rechnitz population, against zero percent in a comparison group; in 1979, 3,350 fibres per cubic metre were measured in residential outdoor air (→ The backstory).

Mesothelioma as a marker. Mesothelioma works as a measure of asbestos in the first place because it is caused almost exclusively by asbestos. But asbestos also causes other cancers, above all lung cancer, and beyond that laryngeal and ovarian cancer (IARC Monograph 100C). Those cases cannot be separated from illness of other origin, least of all from the far more common smoking-related lung cancer, and so they stay invisible in the statistics. How large this hidden additional burden is depends strongly on the fibre type: for the amphibole asbestos types the ratio runs from about 0.7 lung-cancer deaths per mesothelioma death for crocidolite to roughly 4 for amosite (McCormack et al., British Journal of Cancer 2012). For tremolite and actinolite, the amphiboles that predominate in Burgenland, no separate estimate exists; amphiboles as a fibre class are, however, markedly more mesothelioma-causing than chrysotile (Hodgson and Darnton 2000), and the ratio is likely at the low end. What is certain is that, on top of the visible mesotheliomas, a further, statistically undetectable number of asbestos-related lung cancers is added. Mesothelioma thus shows only the clearly attributable part of the asbestos cancer burden.

Small numbers. Mesothelioma is rare, and Burgenland is small. Even a genuinely elevated rate yields only a few cases a year, spread across the whole country and diagnosed decades after exposure, not as a visible local cluster. On top of this, the cancer registry is unevenly complete by region: the east of Austria was historically recorded less completely than the west, which has a longer tradition of regional cancer registries (Statistik Austria, Standard-Dokumentation Krebsstatistik, sec. 3.4.2), so the Burgenland counts are more likely to understate than to overstate. Invisible, here, is not the same as absent.

The medical background to this (mesothelioma and lung cancer, latency periods, the fibre-year as a measure of dose) is in the blog: → Asbestos and health.

Studied and regulated elsewhere: New Caledonia, Metsovo and California

The Burgenland constellation, asbestos-bearing serpentinite spread as gravel on roads and tracks, is well studied and in places strictly regulated elsewhere.

In New Caledonia, an analysis of the local cancer registry (109 mesotheliomas, 1984 to 2008) identified the presence of serpentinite on roads as by far the strongest environmental risk factor for mesothelioma (incidence rate ratio of 13; Baumann et al., Environmental Health Perspectives 2011, doi:10.1289/ehp.1002862). What was studied there is exactly the pathway at the centre of the Burgenland case: crushed serpentinite on roads.

The link is documented in Metsovo, Greece, as well: an endemic cluster of pleural plaques (in about 46 percent of those examined) and pleural mesotheliomas (six confirmed deaths, roughly one percent of deaths in 1981 to 1985) is attributed to a local, tremolite-bearing whitewash used in almost every house before about 1940 (Langer et al., The Lancet 1987). It is the same fibre type that predominates in Burgenland: tremolite.

In California the environmental regulator, CARB, has long drawn the regulatory consequence. Material for surfacing, that is unpaved roads, car parks and paths, may contain no more than 0.25 percent asbestos (the earlier limit for serpentine was 5 percent), precisely because crushing and driving release fibres. That proximity to naturally occurring asbestos measurably raises the risk is shown by an analysis of the California cancer registry: for every additional 10 kilometres of distance from the nearest natural asbestos source, the odds of mesothelioma fell by about 6 percent (odds ratio 0.937), independent of occupational exposure and statistically significant in men (Pan et al., American Journal of Respiratory and Critical Care Medicine 2005). We set out that rule on the standards page (→ Asbestos standards, CARB ATCM 17 CCR 93106); for the geology of naturally occurring asbestos in serpentinite see the blog (→ Serpentinite, asbestos and the geology of the Rechnitz window).

The geology and the evidence in Burgenland are the same as there. What differs, so far, is mainly the response.

In July 2026 the Environment Ministry confirmed to the APA news agency that an amendment to the Landfill Ordinance is being prepared, „um mögliche Engpässe durch künftig größere Mengen an asbestbelastetem Gesteinsmaterial zu vermeiden" (to avoid possible bottlenecks from larger future quantities of asbestos-contaminated rock material). The aim of the amendment is said to be making it easier to build dedicated landfills for naturally asbestos-contaminated rock material; former quarries could in principle be considered. „Voraussetzung dafür ist jedoch eine entsprechende abfallrechtliche Genehmigung als Deponiestandort" (this requires, however, an appropriate waste-law permit as a landfill site), it added. A draft for review has not yet been made public.

Fiscal law (since 30 July 2026): For rock materials with geogenic asbestos contents, the remediation levy no longer applies, provided they are lawfully deposited or returned to the original deposits (BGBl. I No. 62/2026, Art. 48). That is a fiscal exemption; it changes nothing about the landfill-law requirements (→ What happens next).

The ministry's proposal has a certain logic: the material would return to where it geologically comes from. Whether that holds is a factual question, and it splits into three sub-questions. How does crushed, stockpiled rock behave in terms of fibre release? Can fibres reach groundwater from there? And would that be relevant to health if they did? The literature answers these three questions with differing clarity.

Rock fabric and crushing behaviour

The obvious assumption is that crushing creates fibres. In that generality it does not hold, and the precise version matters for the landfill question.

Chatfield (2023), who declares consulting and travel reimbursement from the National Stone Sand and Gravel Association, the US aggregates-industry association, ground 48 samples from 46 minerals by a uniform protocol, elutriated them in water and counted them by transmission electron microscopy. His finding concerns the ratio, not the amount: whether a crushed amphibole yields regulated, carcinogenically dimensioned fibres or predominantly cleavage fragments is a property of the material's crystal habit, and this ratio is insensitive to the degree of grinding. Non-asbestiform amphiboles did yield 10⁹ to 10¹⁰ respirable particles longer than 5 micrometres per gram of respirable dust, but these were predominantly cleavage fragments: consistently under one percent fell into the narrower size range that Chatfield assigns to carcinogenic effect. The absolute number of these particles does rise with the degree of grinding; what stays unchanged is their share of critical fibres.

From this follows a twofold statement. The claim that crushing creates fibres out of fibre-free rock does not hold. The claim that an already asbestiform rock releases respirable fibres under mechanical working does hold. For a landfill that would receive asbestos-bearing material, the second statement is the relevant one.

Geologically, Marzini et al. (2024) point in the same direction, though on a related and not identical rock type. Tuscan and Calabrian serpentinite was studied. In the standardised crushing test, massive, undeformed serpentinite has a Release Index near zero, at a chrysotile content of up to 20 to 25 percent; only cataclastically deformed, veined variants score high, at values of 0.58 to 0.76 against a threshold of 0.1. What transfers from this is the finding that the deformation of the rock, not crushing as such, governs release. The fibre quantified there is chrysotile, not the tremolite and actinolite that predominate in the Rechnitz window; the transfer to the amphibole case is not automatic, in either direction.

The fraction that would be landfilled

A landfill would not receive the intact rock mass, but material that is already crushed, comminuted, weathered and stockpiled. For material of this kind, release measurements exist; a direct comparison with the intact rock mass was not carried out in the works drawn upon.

Maulida et al. (2022) studied soils from two abandoned asbestos mines in a test chamber. Release into the air rises with wind speed and falls with soil moisture. At the more strongly emitting of the two mines, the measured maxima rose from 0.023 fibres per cubic centimetre at a soil asbestos content of 0.25 percent to 0.471 at 0.75 percent, in each case at 5 metres per second wind speed and in the chamber test, not in the field. Buck et al. (2013) report that weathering does not substantially change fibre morphology; the material therefore does not defuse itself.

That mechanical intervention in asbestos-bearing rock puts fibres into the air is also documented from tunnelling. Gaggero et al. (2017) found, at the face of a drive through a serpentinite lens that the authors describe as a chrysotile occurrence, values above 2 fibres per litre in 84 percent of 128 samples, against 2.6 percent in the 668 samples from asbestos-free rock. Complete reporting includes the result of the same work: the protective measures held. The concentration stayed below the Italian occupational limit of 100 fibres per litre, and all samples in the outdoor area were below 1 fibre per litre. Fibre release at a worked rock body is real and at the same time technically controllable; that is the content of this measurement series.

The fibre type in the Rechnitz window

The works cited so far concern partly chrysotile (Marzini, Gaggero), partly already amphiboles (Maulida tremolite, Buck actinolite, Chatfield crocidolite). In the Rechnitz window the matter is essentially tremolite and actinolite, and the difference between the fibre types is biologically significant.

Bernstein et al. (2005) measured biopersistence in an inhalation experiment. Tremolite remained in the lung over the animals' lifetime with a practically infinite half-time and produced, even at sixteen times fewer total fibres, a mild interstitial fibrosis, in a study that, according to the authors, was not specifically designed to assess pathology. For context, the entire study was funded by the Union Carbide Corporation, the manufacturer of exactly the Calidria chrysotile it tests in the other study arm. The chrysotile statements of such manufacturer-funded works are contested in the literature; drawn upon here is the amphibole finding alone. The low biological solubility of amphibole fibres corresponds to the generally accepted state of knowledge, but in our material it rests on this one manufacturer-funded study, which should be stated.

Should fibres from such a deposit reach the breathing air, it would accordingly be a material that the lung does not clear again.

The water pathway

Here precision matters more than effect, because much that is imprecise is in circulation in both directions. The result in advance: for an orderly, covered landfill a contamination of the groundwater is not shown.

That asbestos can in principle get into water is undisputed. The IARC lists, as possible entry routes, the erosion of natural deposits and the leaching from waste asbestos in landfills (IARC 2012, Monograph 100C, page 229); this is a general enumeration of conceivable routes, not proof for a specific, orderly landfill. Millette et al. (1980) report up to 74 million fibres per litre from a water supply in Kentucky; the suspected cause is the erosion of an old, exposed chrysotile spoil heap, that is, uncovered chrysotile at the surface. This is the opposite of a covered amphibole landfill body, which is what is at issue here, and their work is moreover an evaluation of more than 1500 previously reported analyses, not a field study of the site. For an orderly, covered landfill such an entry is not shown. What such figures mean for health is treated in the next section; anticipating it, in a supply area of about 200 million fibres per litre no convincing indication of a cancer risk was found (Polissar et al. 1984).

Whether asbestos also moves in the subsurface was long given little attention. Amphiboles, unlike chrysotile, are negatively charged at any pH, as is the quartz sand; like charges repel, so such fibres are rather to be expected as mobile. Magherini et al. (2023) tested this in a column experiment, with washed quartz sand as an aquifer analogue and crocidolite as the fibre material, and confirm it: fibres 5 to 10 micrometres long passed all tested grain sizes. A statement about how many fibres arrive over what distance in a real aquifer does not follow from this.

The limits of this experiment belong with it. It involves six columns ten centimetres long, not a field demonstration; ranges and time scales the authors themselves name as open. Crocidolite was tested, an amphibole, but not the tremolite and actinolite that predominate in the Rechnitz window. Of the introduced fibres, only 0.18 to 0.40 percent in total were moreover recovered at the column outlet; in the low-concentration set, meant to represent a plume far from the source, it was 1.95 to 7.00 percent. And the measurement itself is at present not robust: Avataneo et al. (2023), whose working group includes three authors employed by the remediation operator of the Balangero asbestos mine (RSA Srl), which also provided the sample studied, had the same filtered water sample evaluated by two laboratories under different instrumental conditions and obtained 4.44, 2.85 and 3.21 times ten to the seven fibres per litre, with the confidence ranges of the two laboratories not overlapping. This caveat applies to every waterborne fibre figure, including the 74 million from Kentucky.

The robust formulation is therefore: the entry pathway is documented, the transport of one amphibole, namely crocidolite, is demonstrated in a laboratory experiment, not tested for tremolite and actinolite, and not demonstrated in the field. For an orderly, covered landfill for asbestos-bearing rock, a groundwater contamination has so far not been shown.

Uptake via the digestive tract

Whoever talks about groundwater sooner or later talks about drinking water. Here the state of evidence turns out differently from what the obvious narrative expects, and in both directions: a harm from ingested asbestos is not established, and its harmlessness is just as little established. What the authorities record is the absence of robust evidence, not the presence of an all-clear.

The World Health Organization records in its background document to the drinking-water guidelines that there is „no consistent, convincing evidence that ingested asbestos is hazardous to health", and derives from this that no guideline value need be set (WHO 2003). The US Environmental Protection Agency lists, in its IRIS assessment for the oral pathway, neither a reference dose nor a cancer risk value; the animal database is described as limited and refers to benign polyps in male rats (US-EPA IRIS). The American drinking-water limit for asbestos is 7 million fibres per litre for fibres longer than 10 micrometres (40 CFR 141.62); according to the evaluation by Go et al. (2024) it rests on precisely these benign intestinal polyps, dates from 1985 and expressly does not cover the air pathway.

The most recent systematic review comes from the consultancy Risk Sciences International and was commissioned by Health Canada; it feeds, according to the authors, into the ongoing revision of the Canadian drinking-water guideline for asbestos. It assessed 15 cancer organ systems and three non-cancer endpoints and arrives throughout at „very low confidence" or „inadequate evidence"; not a single endpoint reached adequate evidence (Go et al. 2024). A caveat belongs with it, and it cuts against a too-comfortable reading: under the system that this review follows, only the highest confidence level („High") means the positive proof of harmlessness. What was reached was „very low". „Inadequate" means not assessable, not harmless.

Delimitation: inhalational occupational exposure

To be kept strictly separate from uptake via water, and named here only for delimitation, is occupational exposure via the breathing air; it concerns inhaled, not swallowed fibres. Koehoorn et al. (2024), funded by the Workplace Safety and Insurance Board Ontario, an accident insurer, brought together 192 studies of workers exposed occupationally, that is via the breathing air. From inhaled, not from swallowed exposure come the elevated risks found there for oesophageal, stomach and colorectal cancer; they follow an internal gradient: in cohorts without excess lung-cancer risk the effect is at zero, at at least a doubled lung-cancer risk it rises. This work concerns inhalational occupational exposure; environmental and mixed-exposure studies were expressly excluded, and the authors themselves draw no connection to uptake via water. It is therefore no evidence for a drinking-water risk. For tremolite and actinolite, the fibres that predominate in the Rechnitz window, the state of knowledge on uptake via water is practically empty: of 60 animal experiments in the Go evaluation, 34 concerned chrysotile and only two tremolite, with actinolite not among them.

The legal position

The current Landfill Ordinance 2008 contains no provision tailored to geogenic asbestos-bearing rock material. The word „Steinbruch" (quarry) does not appear in it, and its mentions of „geogen" (geogenic) concern background contents of excavated material, not asbestos; a site category by prior use the ordinance does not know at all, it assigns by landfill class and acceptance criteria.

What it does regulate is the deposit of asbestos waste, in section 10, with a catalogue of duties that the following section returns to. Whether geogenic asbestos-bearing rock material falls under this provision, whose conditions turn on bound or packaged asbestos, is thus not expressly settled. According to the Ministry, the announced amendment is to make the establishment of such landfills easier; how far it merely orders or extends an existing permitting practice cannot be judged without a draft for review.

Our assessment

The question of whether worked-out quarries should receive asbestos-bearing rock cannot, on the current state, be answered via drinking water, nor via the blanket claim that crushing creates fibres. The literature supports neither.

What it does support is narrower. First, already asbestiform material releases fibres under mechanical working, and for fine-grained, stockpiled material a wind- and moisture-dependent release into the air is documented from comparable situations; a direct comparison with the intact rock mass is not available, nor is a measurement at a landfill for crushed asbestos-bearing rock. Second, in Burgenland the matter is amphibole asbestos, which is biologically practically not broken down. Third, current law already requires a demanding catalogue of duties for deposited asbestos waste, while a dedicated provision for geogenic asbestos-bearing material is still lacking.

That the material geologically returns to where it comes from is accurate and does not answer the question. It returns in a different form, crushed instead of intact, and into a facility to which waste law attaches duties. Which duties in detail will only be assessable from the draft for review. What the covering of such a deposit means in practice is treated in the following section.

Once asbestos-bearing gravel has been laid, under a road, a car park or a path, the question arises whether the material is removed or covered and left in place.

Both are recognised routes of remediation in Austria. Austrian law has already spelled out the difference, albeit for a different case: for contaminated sites (Altlasten), that is for significantly contaminated old deposits or old locations from the time before 1 July 1989 (section 2 no. 1 to 3), the Contaminated Sites Remediation Act defines remediation in section 2 no. 6 to 8 as decontamination, that is the „weitgehende Beseitigung der Kontamination und deren Ursache" (extensive removal of the contamination and its cause), or as securing, that is the „dauerhafte Verhinderung der Ausbreitung von Schadstoffen" (permanent prevention of the spread of pollutants). To recently installed material this is not directly applicable; the terms describe the choice precisely nonetheless. It is not one between right and wrong, but one between two different obligations, and this difference can be read where the legislator has written it out.

What the legislator requires of covering, where it has regulated it

The Landfill Ordinance 2008 regulates, in section 10, the conditions under which asbestos waste may be deposited. Four of its sub-paragraphs describe not a construction state but a permanent state:

The surface cover of the landfill body must permanently prevent a release of fibres (no. 7). No works may be carried out on the landfill body that could lead to a release of asbestos fibres (no. 8). After the end of the deposit phase, a site plan with the exact location of the asbestos deposit is to be transmitted to the authority, and the authority is to forward a copy to the body responsible for local spatial planning (no. 9). Authority and operator are to take suitable measures to restrict the possible use of the site (no. 10).

These duties apply to landfills, not directly to a layer of gravel left under a road. Their significance for the question treated here lies in the valuation: where the legislator has regulated the covering of asbestos, it holds it to be sufficient only together with these four permanent duties. The duties under no. 7 to no. 10 continue after completion: maintenance of the cover, a ban on works on the landfill body, a site plan with the authority and spatial planning, restriction of future use.

California

That such a response structure is not confined to Austria is shown by Harper (2008) for El Dorado County in California. There, for naturally occurring asbestos, a duty to notify the air-quality authority within one working day exists once asbestos is encountered during construction, excavation or mining works; mandatory dust suppression and mitigation measures for the areas disturbed by the works; and a disclosure duty on the sale of real estate. Harper at the same time records that these regulations do not prohibit construction activity and that the responses have turned out differently from site to site. The disclosure duty he describes as a component of the El Dorado ordinance; for the regime in Fairfax County, Virginia, also presented, he names no such duty. Considerable effects on property values he reports as well, but records expressly that these are in part out of proportion to the actual health risk and can be driven by media attention.

These are two different legal orders and two different cases of application, a Californian occurrence in the ground and an Austrian asbestos-waste landfill, but comparable building blocks: notification and dust control on both sides, in Austria additionally the land-use restriction of the site (section 10 no. 10), in California additionally the disclosure on sale.

How demanding dust suppression is in water during an active work phase can be read off from a figure from building demolition. Perkins et al. (2007) report, from two building demolitions with asbestos-bearing, non-friable material, a water consumption of 75 to 225 cubic metres per day over the duration of the demolition; their own measurement found a negligible fibre release in the process. The figure quantifies the effort of an active intervention, not that of a permanent cover; a comparable figure for the permanent operation of a covered deposit is not available in the material evaluated.

Working on bound material: the measured values

The weakest point of any leave-in-place solution is not the day of completion, but the day on which someone later works at that spot.

Ervik et al. (2023) measured at real remediation objects in Norway. The highest concentrations counted over a work shift occurred at friable, amphibole-dominated insulation boards, with a median of 2.6 fibres per cubic centimetre; the dismantling of asbestos cement in the outdoor area was well below that, with median values around 0.2. In separate 60-second measurements with a real-time fibre monitor, drilling and cutting with a reciprocating saw on asbestos-cement roof shingles produced peak values above 30 fibres per cubic centimetre; this device does not distinguish asbestos from other fibres, and the filters drawn in parallel were, because of the short sampling time, not counted, but showed numerous asbestos fibres. The authors classify the short work steps as an everyday risk: such works could be carried out without the person doing them knowing the nature of the material and the risk.

A side finding is instructive. On removing roofing felt and battens, that is material that was itself asbestos-free, 0.1 fibres per cubic centimetre were measured. The authors attribute the fibres to the weathered asbestos-cement sheet underneath, since the roofing felt itself contained no asbestos. It is therefore enough to work nearby.

That the binding weakens over time is likewise described, though for a different material. Macher et al. (2026) found, on weather-exposed asbestos-cement samples, a higher infrared-spectroscopic detectability of chrysotile than on unweathered reference samples and attribute this to surface degradation; the method is expressly classified by the authors as comparative and semi-quantitative. This concerns bound asbestos cement and chrysotile, not an asphalt cover over loose gravel.

These findings come from occupational safety at buildings, not from a road and not from a landfill. What transfers is the mechanism, not the figure: mechanical working releases fibres, regardless of whether the material lay inconspicuously before. This holds for the later utility trench in the covered structure just as for the excavation during removal itself.

The Szombathely case

In Szombathely, near the Burgenland border, asbestos-bearing gravel lies over twelve kilometres of road length in a residential area of 21 streets. On 16 July 2026 the government spokesperson announced that the material would be removed; according to an earlier calculation by the responsible ministry, it concerns, for the Oladi plató alone, about 84,000 tonnes and a net roughly 3.6 billion forints (HVG, 16 July 2026).

It is tempting to read from this that Hungary has decided that covering does not suffice. The primary sources do not yield that, and this precision matters more than the catchier narrative.

Up to issue no. 94 of the Hungarian official gazette of 20 July 2026, no legal instrument ordering the removal is found. The announcement was made politically, at a government press conference. The expert opinion commissioned by the Vas county administration (KÖR-KER Kft., 8 April 2026) places both routes expressly side by side, with the Hungarian phrasing „Ez két módon lehetséges" (this is possible in two ways), and expresses no recommendation. The government itself justified acting in this area with the extent of the contiguously affected area and recorded at the same time that the contamination, through the interim measures, is currently below the health limit. On 17 July the choice of method was, on the mayor's account, still open and was to be decided in cabinet only in the following week. The ministry report on which the decision rests has not been published.

On 23 July 2026, the government presented the way forward at a briefing by the government spokesperson, in the presence of Prime Minister Magyar: asphalting instead of removal for the affected roads (index.hu and hungarytoday.hu, 24 July 2026), starting where above-limit airborne concentrations had been measured, financed from a new asbestos fund of 3 billion forints (HVG, 24 July 2026). The conditions named for the fund are an asbestos map, regular measurements and quarterly reports; the responsible minister, Gajdos, set them out, according to index.hu, in a social-media post. Greenpeace Hungary and other experts continue to call for the permanent removal and proper disposal of the material (hungarytoday.hu, 24 July 2026).

The announcement of 16 July that the material would be removed is thus superseded for these roads: what is announced now is asphalting. Two things remain open here. First, hungarytoday.hu speaks of a new resolution but, like HVG and index.hu, names neither a number nor a citation; the cabinet decision announced on 17 July thus remains without a documented legal instrument. Second, the reports do not fully align on the method: index.hu and hungarytoday.hu report asphalting as the chosen path for the affected roads, while the government spokesperson, according to HVG, left open which remediation technology will be used; the decision is to be coordinated with the municipalities according to residents' needs. A fixed national method follows from none of the three reports.

As a result, the paths chosen in Vienna, Burgenland and Hungary currently converge on covering: Vienna announces the sealing of the confirmed surfaces with a sealing layer (→ Locations), the province of Burgenland relies on watering at Großpetersdorf and plans asphalting (as per the status of 22 May 2026, not new), and asphalting is announced for the affected Hungarian roads (on the technology question left open per HVG, see above). This is a description of the paths chosen, not an assessment; the analysis above of later mechanical intervention in covered structures applies unchanged to each of these surfaces.

The further-reaching statement that a direct bitumen sealing is unsuitable, because it cracks over time, must be reopened during later utility works and increases the volume of hazardous waste to be disposed of later, comes from Greenpeace Hungary in an open letter of 3 June 2026. That is the position of an environmental organisation, not an official finding. On the official side, by contrast, the interim bitumen sealing in the Síp utca was carried out on the basis of the technical information of the Hungarian National Centre for Public Health and Pharmacy (NNGYK), and the county administration recorded, on the basis of air measurements of 18 June 2026, that the measures taken were effective; that concerns dust control in the interim state, not the question of the permanent duties. The mineralogist Tamás Weiszburg of the Eötvös Loránd University Budapest, who is also entrusted with the investigation of the Rechnitz quarry, holds sealing to be a legitimate route and names time and available means as the actual decision variables (Telex, 27 April 2026).

What the Szombathely case shows is therefore not a verdict on sealing, but the asymmetry that the commissioned expert opinion too names. It records expressly, for sealing, that a solid, non-dusting cover of concrete or bitumen ends the escape of fibres into the ambient air as long as it stays intact. It names at the same time the other side, which here is to be reproduced as the expert's finding and not as this section's own valuation: with the removal of the asbestos-bearing rock, the exposure of the population and of those later working there can be ended or avoided; if the material is instead covered, a source stays in place that is exposed again with potholes or utility works, which then exposes workers and requires a permanent regulatory order.

Our assessment

The choice between removal and covering is mostly conducted, in the public debate, as a question of price. It is rather a question of where a permanent duty is borne in future.

Covering is at first cheaper and, where it is regulated, legally permissible. But it leaves an ongoing burden: a cover with maintenance need, the re-exposure during future utility works, the need for permanent rules for every activity at that spot. In the case of a road, this burden is not the statutory permanent duty of section 10, since a road is not a landfill; it is a practical one, which, where the legislator has regulated the covering of asbestos, feeds into precisely those duties. Removal ends the burden at this spot. It is at the same time an exposure-intensive work step, since the excavation directly disturbs the loose source material, and requires corresponding protective measures; the material does not disappear but becomes asbestos waste, for whose deposit waste law provides the permanent duties of section 10, insofar as the material falls under its acceptance criteria, and for which section 10 subsection 2 excludes a reclassification.

Both routes therefore leave a continuing obligation, only of different kind and at a different place: with removal a statutory one at the receiving landfill, with covering a practical one, distributed over an inhabited area. For the Burgenland debate, no recommendation in the individual case follows from this, since that depends on quantity, location, fibre type and use. What does follow is that a cover should not be booked as a conclusion.

Our own sampling: two findings from May 2026

We had two of our own samples examined by the DAkkS-accredited testing laboratory CRB Analyse Service GmbH (accreditation number D-PL-19161-01-00). Sampling was carried out on 22 April 2026 by Ungiftig FlexCo. The analysis was performed according to VDI guideline 3866 sheet 5:2017-06, the procedure established in Germany and Austria for the qualitative identification of asbestos in material samples by scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX). The underlying fibre definition follows the WHO criteria (length > 5 µm, diameter < 3 µm, length-to-diameter ratio > 3:1).

Finding 1: path gravel of a playground in Kotezicken (Burgenland)

Mineralogical classification: actinolite is a mineral of the amphibole group and is among the asbestos forms classified by IARC and the WHO as human carcinogens of class 1. According to the current state of mineralogical and epidemiological research, and expressly also according to the assessment of Prof. Tamás Weiszburg (Eötvös Loránd University Budapest), actinolite asbestos is considered significantly more aggressive than chrysotile. The cross-section dimension of the fibre of 1.988 µm marked in the SEM image (CRB attachment sheet 2/2) documents the fibre diameter (short axis) and is thus within the WHO fibre definition (diameter < 3 µm); the fibre length of the actinolite fibre shown is, by the 10 µm scale bar, clearly above 5 µm and thus, together with the aspect ratio > 3:1, meets the WHO fibre criteria.

Assessment of the site: this is the path gravel of a public playground. Everyday mechanical loading takes place there, through walking, running, playing, digging in the gravel, through cleaning vehicles and weather. Precisely the forms of loading that, according to the state of NOA research (see the in-depth analysis of Hungary above), lead to fibre release into the air. From an environmental-medicine point of view, the presence of actinolite asbestos in the path gravel of a playground is not acceptable.

Finding 2: loading ramp of a non-closed quarry (southern Burgenland)

Mineralogical classification: chrysotile (Mg₃Si₂O₅(OH)₄) is the serpentine form of asbestos, likewise an IARC class 1 carcinogen, mineralogically typical of serpentinite deposits. The EDX spectrum shows the classic chrysotile signal with dominant magnesium and silicon; the SEM image shows the long, bundled fibre structures characteristic of chrysotile. Mass class 4 (20 to 50 percent) means: asbestos is not a trace impurity but a dominant component of the material.

Geological classification: the sampled quarry lies in the same geological complex as the four officially closed quarries: in the southern-Burgenland Rechnitz Window, an ophiolite sequence, that is, a geologically coherent series of former ocean-floor rocks. In such complexes the various rock types are spatially interlocked, and their transitions are often gradual. According to standard petrology, fibrous minerals can form during hydrothermal mineralisation along fractures and shear zones, including chrysotile (generally e.g. Van Gosen & Clinkenbeard 2011 on naturally occurring asbestos in metamorphic rocks; no petrological study specifically of the quarry sampled here exists). The formal lithology label of a quarry in the mining register is therefore, in our assessment, not a reliable proof that the material is asbestos-free; what remains decisive is the mineralogical investigation of the actual sample. The fact reported here is the laboratory finding (SEM-EDX: chrysotile), not the genesis.

Assessment of the site: this is a single spot sample from one point (the loading ramp), not a representative, mass-averaged value for the entire production of the quarry; it is therefore not directly comparable to an operator's quantity figures. The finding does, however, suggest that closing four quarries does not necessarily conclusively address the regional asbestos problem: in a further, non-closed quarry of the same geological complex our sample was asbestos-positive too.

Finding 3: TerraDiabas® rock flour, a retail product from the Burg quarry

Assessment: TerraDiabas® is a rock flour milled from the diabase of the Burg quarry and distributed as a soil conditioner (advertised on the product page terradiabas.at as "100% pure natural product of volcanic origin") for garden and agriculture. Tremolite belongs to the amphibole group and, like all asbestos forms, is classified as a human carcinogen (IARC/WHO group 1). The finding concerns the commercially available end product: tremolite asbestos was detected in our retail-bought sample. On the question of how needle-shaped amphibole particles are to be counted as asbestos fibres, see the methodological note on the standards page.

Addendum (as of 1 July 2026): The provider's website terradiabas.at now lists the product as "currently unavailable" (first documented in the Internet Archive on 24 June 2026). This is a de-facto sales halt, not an official recall; there is no AGES product warning, and no asbestos notice appears on the website.

What these findings document

• The asbestos contamination is possibly not limited to the four officially closed quarries: in a further, non-closed quarry of the same geological complex our spot sample from the loading ramp was asbestos-positive (chrysotile, mass class 4). A single spot sample is, however, not a representative production value.
• A retail-available garden product is also asbestos-positive: the TerraDiabas® rock flour milled from the diabase of the Burg quarry contained tremolite (mass class 3) in our sample. The material thus reaches end users in finely milled, ready-to-spread form as well.
• The regional geology makes it plausible that further quarries declared as "non-serpentinite" in the same tectonic unit could show similar findings. A systematic sampling of all active quarries in the southern-Burgenland area by an independent body is overdue.
• The findings come from an accredited DAkkS testing body, methodologically according to VDI 3866 sheet 5, that is, according to exactly the standard criticised in the ARGE releases but standard in accredited testing laboratories.
• Actinolite (amphibole asbestos) in the path gravel of a playground is a clearly action-relevant finding. The fibre type corresponds to the class described by Prof. Weiszburg (ELTE Budapest) as "roughly a hundred times more aggressive than chrysotile".

Test reports to download

The full CRB Analyse Service GmbH test reports, including SEM images, EDX spectra and a description of the method, are available here:

📄 Download test report 26-07865 (PDF, 3 pages): TerraDiabas® rock flour

Test report 26-06249 (Kotezicken & loading ramp) is no longer offered publicly for download for legal reasons; it can be requested where there is a legitimate interest at servus@ungiftig.at.

Dispersion modelling GeoSphere Austria (as of 31 May 2026)

The legal situation: rules, effect and liability

This section records which rules applied to asbestos naturally occurring in rock, what they prevented and what they did not, and which liability questions are currently open. Several legal logics stand side by side. We document them and attribute each to its source; we do not decide who is right or who is liable.

1. The asbestos ban and what it covers documented

Placing asbestos on the market is regulated in the EU via REACH (Annex XVII, entry 6) and via the CLP Regulation (asbestos = carcinogen 1A); the workplace via worker-protection law, extraction via the Mineral Raw Materials Act. These rules target asbestos intentionally added to products and occupational safety. What they do not have in view: asbestos that occurs naturally in the extracted rock. (the regulatory chain in detail on /en/asbestos-standards/)

2. Naturally occurring rock between the rules: product or raw material?

Unaltered natural minerals are exempt from registration under REACH Annex V; the general carcinogen restriction (entry 28) only prohibits supply to the general public and permits commercial supply. Gravel distributed as a natural raw material thus falls between the product rules. per Átlátszó / EUalive this is read as an exploited EU loophole (atlatszo.hu, 29.5.2026); a study by the group around Prof. Weiszburg documents that the EU system has so far barely captured naturally occurring asbestos (of 378 EU asbestos questions 1995–2024, only 13 with an NOA reference; Environmental Sciences Europe, 2025).

3. Competence and effect documented

Federal Minister Totschnig states in the written-question response 4055/AB-BR/2026 (12.5.2026) that there are "no gaps in the law". In the same text he describes the exemptions that the criticism takes issue with.

4. The GKV amendment 2025 and the January 2026 closures documented

On 31 December 2025, the GKV amendment (BGBl. II No. 339/2025, transposing EU Directive 2023/2668) lowered the workplace limit for asbestos fibres from 100,000 to 10,000 F/m³ (second step 2,000 F/m³ from 21.12.2029). The closures of the four quarries on 2 January 2026, however, rested on § 175 of the Mineral Raw Materials Act ("imminent danger") and the asbestos finding from official material samples taken in November 2025, not on the workplace value.

5. Who pays? The polluter-pays principle, liability and ongoing proceedings

• Hungary: per Telex/ORF at the meeting with Federal Chancellor Stocker on 21 May 2026 in Vienna, Prime Minister Magyar called the polluter-pays principle an internationally applicable rule and demanded compensation (on the order of "tens of billions of forint"); the polluter must pay, "whether company or state" (Telex / ORF, 21.5.2026).
• Austria: per ORF Federal Chancellor Stocker pointed to the domestic competence of the Province of Burgenland and the closures already carried out, pledged support to Hungary and left the question of liability or compensation open (ORF, 21.5.2026).
• Bilateral: documented a joint Austrian-Hungarian working group (work starting the following week) and a government meeting in Gödöllő in September 2026 (Telex, 21.5.2026).
• Government decree: documented 1134/2026 (IV.30.) orders an investigation of origin and liability "with particular attention to deliveries from Austria" and sets a cost accounting by 31 October 2026 (Magyar Közlöny 2026/42).
• Criminal: documented complaints by Mayor Nemény (against the operators, possibly the Austrian state), by the Hungarian environmental authority and by Greenpeace (Eisenstadt public prosecutor's office).
• Party-political: per Magyar Nemzet on 6.6.2026 the Fidesz MP Pócs János accused Magyar of demands that were too modest (a party-political sharpening).

6. What was known when open

The prior-knowledge record reaches far back: the Rechnitz study of 1979 (pleural plaques, 3,350 F/m³ in the open ambient air), distribution since the 1990s, the ministerial recall of a bag of road grit in 2008, the ÖSBS expert report of 1995; a 1999 ruling of the Administrative Court described the material of the Tauchental asphalt mixing plant as "asbestos-bearing". (to the background; to the backstory)

7. The current state of politics documented / open

• Austria: resolution motion 751/A(E) (Greens/Hammer, received 25.2.) postponed in the Environment Committee on 17.4. (ÖVP/SPÖ/NEOS); special session of the Burgenland provincial parliament 16.2. (resolution for a federally uniform regulation); federal working group on asbestos contamination (announced 21.5.: three federal ministries and the Labour Inspectorate, aim of federally uniform rules).
• Hungary: government decrees 1134/2026 and 1156/2026 (government-wide investigation orders); 1181/1182 (5.6., environmental authority and sanctions, asbestos not named explicitly, reproduced with that caveat); written question by Ágh Péter on financing the remediation (exists; the iromány number cannot be reconstructed because of the CAPTCHA block on parliament.hu).

On neither side has an asbestos-specific law been enacted; the regulatory questions remain politically open.

In full: the federal and parliamentary responses (4053/4055)

Two statements by Hans-Peter Hutter in Falter, cross-checked against the record (26 May 2026)

In Falter (issue 22/2026), taskforce head Hans-Peter Hutter doubted the origin of the gravel and the Hungarian measured values. Both statements are incompatible with the publicly documented record.

• The laboratory: the high Szombathely values (up to 292,000 fibres/m³) were, according to Greenpeace, determined "with the involvement of the same laboratory that is also active for the Province of Burgenland", that is, by the Vienna firm ESW Consulting WRUSS (ORF, 2 February 2026). The lower Austrian values come from fibre-suppressing winter and damp conditions (830 fibres/m³ on wet ground, Salzburger Nachrichten, 5 March 2026).
• The origin: the NAV freight data (EKÁER) document deliveries from the four quarries to around 250 Hungarian municipalities; they had been public since 23 May 2026. Hutter's "not clarified" is dated 26 May 2026.

Detailed analysis with all sources: → Fact-check: the Falter statements by Hans-Peter Hutter

Taskforce Asbestos Burgenland: does the province recommend self-disposal of asbestos material?

On 15 April 2026, ORF Burgenland reported on a find in Ollersdorf. In the same report, the provincial taskforce was quoted with the following recommendation:

"Municipalities and private individuals should remove proven asbestos or suspect material using water and dispose of it properly."

On the question of where it goes, the taskforce said the original seller, for instance a quarry, was responsible for a return or complaint.

Why this recommendation is problematic

With the amendment to the Austrian Limit Values Ordinance 2025 (BGBl. II 339/2025), the legislator decided that demolition or asbestos-remediation work may be carried out only by employers authorised under § 26 GKV and entered on an official list of the federal ministry. The prerequisites are proven protective measures, extraction or sedimentation of the fibres, decontamination procedures, closed containers for waste, and theoretical and practical instruction under § 25a GKV.

Private individuals are by definition not authorised and cannot be authorised. If the taskforce recommends that they carry out, on their own, exactly those activities that the legislator has reserved for certified specialist firms, that stands in clear tension with the GKV.

Added to this are the requirements for transport and disposal: asbestos-bearing waste is hazardous waste under the Waste Catalogue Ordinance. Handover is permitted only to a collector authorised under § 24a AWG 2002, and transport requires closed packaging with asbestos labelling under § 22a para. 2 no. 3 GKV (a prerequisite for the exemption under SV 168 ADR). Private individuals typically have neither such containers nor contacts to authorised collectors.

On the taskforce's website at burgenland.at/themen/gesundheit/taskforce-vorsorgeabklaerung-luftqualitaet there are more detailed recommendations on protective equipment, which were not, however, reflected in the ORF report. The discrepancy between internal recommendation and public risk communication is the subject of our open letters.

First letter to Prof. Hutter (15 April 2026, private)

Because we receive daily calls from people who want to act on the basis of this recommendation, on 15 April 2026 we sent a formal letter to OA Assoz.-Prof. Priv.-Doz. DI Dr. med. Hans-Peter Hutter, head of the provincial taskforce and specialist in environmental medicine at the Medical University of Vienna.

We ask specifically: on what legal and safety basis does the recommendation for self-removal rest? And: is a clarification planned?

Open letter to Prof. Hutter (26 April 2026)

No reply to the private first letter of 15 April has yet been received. In the meantime, additional points have arisen, in particular the tension with § 26 GKV, the reference value of 1,000 fibres/m³ chosen by the taskforce itself, and the absence of immediate measures at known locations. We follow up with an open letter. The reply will be published here in full and unchanged as soon as it arrives.

Both replies, insofar as they arrive, we document here in full and unchanged. If they fail to come, we note that too.

Open letter to Prof. Kirschbaum (26 April 2026)

In the ARGE Naturgestein OTS releases, several statements are attributed to Prof. Kirschbaum that call for technical follow-up questions. On 26 April 2026 we sent an open letter. The reply will be published here in full as soon as it arrives.

Welche Norm für was: occupational vs public exposure (as of 24 May 2026)

What the taskforce uses

• Reference value 1,000 fibres/m³ for the ambient air in Großpetersdorf. This value is set by the taskforce itself and is not laid down in law. The reference point, according to the taskforce, is a factor of 1/10 of the German workplace acceptance concentration under TRGS 910 (10,000 F/m³ for 8-hour shift exposure). Source: burgenland.at, taskforce FAQ.
• Material analysis by the Montanuniversität Leoben is, according to the publicly available press release of the Province of Burgenland of 8 May 2026, carried out applying TRGS 517 (fibre counting per annex 2). Source: burgenland.at, media service 8.5.2026.
• Common reference basis: all three quantities, that is, the reference value, TRGS 910 and TRGS 517, are developed from occupational-safety law for activity-related exposures. They were designed for the question: how much asbestos gets into the air of a worker during an 8-hour occupational shift in a processing plant?

What does not exist

In Austria there is no statutory limit for asbestos fibres in ambient air. Consistent with this, the Federal Ministry of Agriculture, Forestry, Regions and Water Management (BMLUK), in the parliamentary written-question response 4055/AB-BR/2026, states among other things that for such a regulation "international models" are "not known". In Germany the legal situation is comparable: the TRGS series is occupational-safety law. REACH Annex XVII entry 6 prohibits the placing on the market of asbestos fibres and intentionally asbestos-added mixtures in the EU. However: extracted mineral raw materials of natural origin are exempt from registration under REACH Annex V provided they are not chemically altered (source: BMLUK 4055/AB-BR/2026). The applicability to naturally occurring asbestos in rock is the subject of an ongoing EU discussion. Ambient concentrations and the handling of already installed material in gravel roads are not regulated by REACH (details in the cross-check of the taskforce Q&A).

How California solved this

California faces a geologically comparable situation (serpentinite with naturally occurring asbestos, among others in the Sierra Nevada foothills) and has a binding standard for it: the CARB ATCM Surfacing Applications (17 CCR § 93106) for serpentine-bearing material in unpaved surfaces, threshold below 0.25% asbestos mass content (since 2001, previously 5%). The decisive thing is the choice of method: CARB Method 435 pulverises the sample before evaluation and thus represents the state after mechanical loading, while the TRGS 517 (annex 2) used in Burgenland is tailored to the processing activity. Which question an assessment of the multi-year resident exposure is meant to answer thus remains open. For railway ballast, Italy operates a comparable material limit (0.1%). The full description of methods and thresholds with primary sources (CARB Method 435, TRGS 517, Cavallo 2020) is on our reference page: CARB Method 435 and methodological note.

What the methodology means in the concrete case: worked examples with data from the Rechnitz Window

Worked example A: seven product samples

Mineralogical observation. Worked example A shows a mixed chrysotile-amphibole finding with a dominance of amphibole (tremolite/actinolite) in most grain sizes. Notably: in sample B (0/2) the dust contains 27.9% amphibole but only 4.7% chrysotile. In the same grain size (sample A) the ratio does not reverse, but chrysotile dominates (22.3 vs. 6.9%). This shows the heterogeneity even within the same product type. Samples A and B are two different products of the same grain size 0/2. All samples above the threshold (4-fold to 36-fold).

What the table shows

1. One data set, seven products, ninefold range. The calculated asbestos mass contents range between 0.4 and 3.6 percent (factor 9). All seven samples come from the same model site. The variation is primarily methodological, not geological. The coarser the grain size, the less dust the dusting test releases, the lower the result. Even two samples of the same grain size (A and B, both 0/2) give different values (1.7 vs 3.6%), which shows the scatter of the method for dust-intensive fractions.

2. The implicit assumption. The extrapolation [asbestos in dust] × [dust share] = [total asbestos] gives arithmetically the same result as the assumption that the fraction above 100 µm contains 0.0% asbestos. That is geologically untenable: chrysotile veins and amphibole crystals run through the rock across a wide grain-size range (see methodological note). When a vehicle drives on a gravel road for years, it also crushes the coarse fractions, which then release the same high asbestos share.

3. All values above the threshold. Despite the methodological reduction, every single sample exceeds the 0.1% threshold. The authorities chose TRGS 517 as the procedure; TRGS 517 specifies the 0.1% threshold from § 11 (1) No. 1 GefStoffV. Whoever chooses the procedure implicitly applies the yardstick it specifies, as long as no alternative threshold is defined. Every sample is above it, the lowest fourfold (sample E, 0.4%), the highest thirty-sixfold (sample B, 3.6%). A method that systematically produces lower numerical values than a total analysis of the material cannot calculate that material below its own threshold.

Summary across three worked examples

18 samples from three worked examples in the same geological complex. Every single sample is above the 0.1% threshold. The range goes from 0.2% (factor 2) to 3.6% (factor 36). The three model sites differ mineralogically: worked example A shows a mixed chrysotile-amphibole finding with amphibole dominance, worked example B an approximately equal one, worked example C an almost pure chrysotile finding. This variation is relevant to health, because the cancer risk of amphibole asbestos is, according to the epidemiological data, higher than that of chrysotile (among others Hodgson and Darnton 2000 for amosite and crocidolite; for tremolite and actinolite the data are thinner, but the direction of the finding is consistent).

Methodology critique: what the Großpetersdorf measurements really show, and what they do not (as of 26 May 2026)

With a release of the Province of Burgenland of Friday, 22 May 2026, the provincial taskforce published three measured values for Großpetersdorf (ORF Burgenland, 22 May 2026). The value of roughly 13,000 fibres/m³ is thereby officially confirmed as actually measured on site. The taskforce's methodological framing ("worst-case measurement under extreme conditions") deserves its own sober reading. We provide that here.

Chronology

• 10 February 2026: first measurement, 95 fibres/m³ in damp weather (winter measurement).
• 7 May 2026: second measurement, roughly 13,000 fibres/m³. The taskforce frames this value retrospectively as a "worst-case measurement under extreme conditions". The point at which the result was internally available to or communicated by the taskforce is not publicly documented.
• 16 May 2026: the market town of Großpetersdorf reports, via an information sheet, elevated asbestos values in air measurements in the Mühlschlag area; ORF Burgenland reports the same day (burgenland.orf.at/stories/3354408). A specific figure is not yet contained in the municipal notice at this point.
• 19 May 2026 (Tuesday): third measurement, 300 fibres/m³ under "real conditions".
• 22 May 2026 (Friday): release of the Province of Burgenland with all three values; ORF Burgenland report the same day, 17:51 local time (burgenland.orf.at/stories/3355418). The highest value is framed as "worst case under extreme conditions", the two low ones as representative.

Methodological degrees of freedom

1. When measurement is taken: February damp versus May. Wet, cold winter conditions empirically reduce fibre release considerably (the taskforce itself named this as a limitation of the winter series in its earlier FAQ releases). The 10.2. measurement was taken under conditions where a low value is to be expected in principle.
2. Which conditions are "real" and which "extreme": the taskforce defines both categories itself, without a measurement protocol published in advance. Dry May days with traffic are not unusual in Großpetersdorf.
3. N = 3: three reference days over three months, one sampling point. Too few for a statistically robust characterisation of resident exposure.
4. Timing of the 19.5. measurement: the third measurement was taken three days before the province's release (19.5. → 22.5.) and three days after the municipal report (16.5. → 19.5.). Which considerations triggered the additional measurement is not publicly documented.
5. Who reviews: taskforce-internal measurement, taskforce-internal selection of conditions, taskforce-internal framing of the results. No independent replication publicly documented.
6. Evaluation frame of its own reference: the taskforce chose the acceptance concentration of TRGS 910 (10,000 F/m³) as a reference quantity and derived its reference value (1,000 F/m³) as one tenth of it. TRGS 517 annex 3 governs how compliance with this acceptance concentration is to be demonstrated: at least three measurements on different days, all individual values below half the acceptance concentration (5,000 F/m³); if a single measured value exceeds the acceptance concentration of 10,000 F/m³, "compliance below the value of 10,000 F/m³ cannot be established" (TRGS 517 annex 3, paragraph 5). The measured value of 7 May (roughly 13,000 F/m³) exceeds the acceptance concentration. By the evaluation scheme of the same TRGS from which the taskforce derives its reference value, this measurement series would not have passed. The taskforce does not apply this evaluation scheme.

What the data show

Three measurements, roughly a 137-fold range (95 to 13,000), peak value 13-fold above the taskforce's own reference value of 1,000 fibres/m³. The 13,000 value is a measurement actually carried out, not an artefact. The label "worst case under extreme conditions" is a form of words, not a methodological fact, as long as the measurement protocol for this measurement is not publicly available. Another honest reading of the same data: under at least one condition that actually occurred on site, the asbestos-fibre concentration is 13-fold above the self-set reference value.

Specific demands

1. A full measurement protocol per measurement day: sampling point, measurement duration, pump rate, air volume, fibre-counting standard, weather data (temperature, humidity, wind direction and strength), traffic volume, any mechanical action.
2. Criteria by which 7 May was classified as "extreme" and 19 May as "real".
3. A statistically robust measurement series with N ≥ 10 over distributed summer days under realistic resident conditions, including the distribution of the individual values.
4. Replication of the protocol by a body independent of the taskforce.

Fiscal law: the exemption from the remediation levy

With the Budget Accompanying Act 2027-2028 (BGBl. I No. 62/2026, promulgated on 29 July 2026), the federal legislature amended the Remediation of Contaminated Sites Act (ALSAG) in Article 48. Since then, § 3 para. 1a no. 1 ALSAG also exempts: „Gesteinsmaterialien mit geogenen Asbestgehalten, sofern diese Materialien zulässigerweise abgelagert oder in die ursprünglichen Lagerstätten zurückgeführt werden" (rock materials with geogenic asbestos contents, provided these materials are lawfully deposited or returned to their original deposits). The amendment entered into force on 30 July 2026, the day after promulgation. Under these conditions, no remediation levy is due for such material.

For context: this is fiscal law, not a landfill-law rule. The exemption partly reframes the cost side of deposition; whether and where material may be deposited continues to be governed by existing waste and landfill law (→ Quarries as landfills). Both variants of the exemption (lawfully deposited, and returned to the original deposits) already presuppose the respective permits.

The parliamentary path: the Budget Accompanying Act 2027-2028 comprises 68 articles; on 16 July 2026 the Bundesrat resolved not to raise an objection (ÖVP, SPÖ and NEOS in favour, FPÖ and Greens against).

Procedural status: all four proceedings at the Oberwart district authority

Since 5 August 2026, all four proceedings under the Mineral Raw Materials Act concerning the closed quarries have been consolidated at the Oberwart district authority (Bezirkshauptmannschaft). The basis is the ordinance of the Burgenland provincial government of 31 July 2026 (Bgld. BH-Übertragungsverordnung - Steinbruch Pilgersdorf, LGBl. No. 59/2026, issued on 4 August 2026): it transfers responsibility for the Pilgersdorf proceedings from the Oberpullendorf district authority to Oberwart; the other three proceedings were already there. According to the province's media service, the aim is to bundle similar, complex proceedings in the interest of a uniform approach (ORF Burgenland, 4 August 2026). An official decision on the future of the operations remains outstanding.

Investigation into the passing-on of the expert reports: On 22 July 2026, a spokeswoman for the Eisenstadt public prosecutor's office confirmed a "Kurier" report that an investigation is under way into the allegedly unauthorised passing-on of the quarry expert reports to NGOs; the proceedings are directed against persons unknown, over the suspected breach of a duty of secrecy. The affected quarry operators have filed a complaint; the prosecutor's office tasked the Burgenland criminal investigation office with inquiries. ARGE Naturgestein, which represents the four operations, had earlier criticised that information reached the media before it was itself granted access as a party; it has since, by its own account, obtained access to the files and submitted statements (ORF Burgenland, 22 July 2026). On the status of the criminal complaint that Greenpeace filed with the same prosecutor's office on 17 April 2026, no public reporting is known to us.

What remains open

• The landfill-law question: for the announced adaptation of the Landfill Ordinance, no draft for review has been made public so far (→ Context).
• The official decision on the four closed quarries.
• A rule beyond fiscal law, such as product or ambient-air limit values for geogenic asbestos, still does not exist (→ Reference values).

Whether you might be affected depends not primarily on where you live but on the origin of your gravel, road grit or chippings. The following questions help with a first assessment.

1. Region and supply route

Was material obtained from southern Burgenland in roughly the last 35 years? This obviously concerns municipalities and private individuals in Burgenland, Lower Austria and Styria, but, because of the long distribution chains, also recipients beyond that. Ask the municipality, building contractor, home supplier or, for older deliveries, the purchase contract for the origin and delivery year.

2. Period and use

Material from these quarries was sold widely from 1990, with peaks in the 2000s and 2010s. Typical uses: driveways, garden paths, winter grit granulate, track ballast, playgrounds, school routes, car parks, landscaping areas.

3. Visual cues

Serpentinite is often greenish or green-whitish speckled, sometimes with a silky sheen. Fresh fracture surfaces can look fibrous and splintery. Important: visual identification is not reliable. Harmless, asbestos-free serpentinite also exists, and it can hardly be reliably distinguished by eye from other dark-green rocks such as gabbro or basalt. The eye alone is not enough; for a robust statement a laboratory measurement is needed.

4. Location and exposure

The more sensitive the use (children, school, hospital) and the stronger the mechanical loading (traffic, wind, dryness), the more urgent the clarification. A rarely used garden path that can be covered over if needed is not the same as a daycare playground.

5. Rock flour and milled garden products

The contamination does not affect only loose gravel. Our own DAkkS-accredited laboratory analysis (May 2026) detected tremolite asbestos (amphibole, mass class 3, 5 to 20%) in the soil conditioner TerraDiabas® rock flour, a garden product advertised as "100% pure natural product of volcanic origin", milled from the diabase of the Burg quarry and distributed at retail (listed on the provider's website as "currently unavailable" since late June 2026). Anyone who has bought such a rock flour from the southern-Burgenland area should not spread it, not let it dust dry, and keep the packaging together with the batch details. Details and test report: Finding 3.

For official inquiries about the closed quarries and the ongoing proceedings, the Oberwart district authority has been responsible since 5 August 2026, where all four proceedings are consolidated (→ What happens next); the closures were ordered by the district authorities of Oberwart and Oberpullendorf under § 175 of the Mineral Raw Materials Act.

What is serpentinite, and why does it contain asbestos?

Serpentinite is a metamorphic rock derived from former upper-mantle material that reacted with water over geological periods. Among the minerals that form is chrysotile, the fibrous habit known industrially as "white asbestos". How much asbestos an occurrence contains varies widely: samples from the same quarry can yield 5 percent in one measurement and 50 percent in the next, depending on how hydration and later tectonic loading proceeded. Amphibole asbestos such as actinolite and tremolite forms secondarily in contact zones and is even more localised.

A direct mineralogical confirmation comes from the geologist Friedrich Koller of the University of Vienna, to Falter: "Asbestos forms in the fractures. In some quarries, such as Badersdorf, asbestos veins are more frequent than in other serpentinite quarries." One cannot "tar all serpentinite occurrences with the same brush" (Klatzer/Winterer, Falter 13/2026).

The geology in detail: how mantle rock becomes serpentinite, which serpentine minerals form, why the Rechnitz Window in particular is affected, and how amphibole asbestos forms secondarily, is explained at length in the blog: → Serpentinite, asbestos and the geology of the Rechnitz Window.

• Greenpeace Austria, ongoing sampling campaign; spot samples in several provinces (see sources below).
• Falter, investigation series 13/2026 (24 March 2026, Klatzer/Winterer); multi-part coverage of the 30-year backstory.
• ORF Burgenland, ongoing coverage since January 2026 (closure, Ollersdorf, Pilgersdorf drill, taskforce recommendations).
• vaol.hu / Telex / Index.hu, Hungarian coverage of Szombathely, Sopron, Kőszeg, Zalaegerszeg (see sources).

All sources & evidence

93 sources, grouped by category. Click a category to expand.

For questions about the sources, specific measurement results or the assessment of individual reports: servus@ungiftig.at