Europe Adds Welding Fumes to Its Cancer List — and Leaves the Exposure Limit for Later
Published on 10/20/2026 at 11:41 | Editorial boerse-global.de
Welding fumes now sit alongside asbestos and benzene on the European Union's register of cancer-causing workplace hazards. The Council of the EU adopted the sixth revision of Directive 2004/37/EG — the bloc's framework for protecting workers from carcinogens and mutagens — on 19 October 2026, formally adding welding fumes to Annex I of that list.
What the revision does not do is set a numeric exposure limit for welding fumes. That gap is left open for now, with the European Commission examining possible follow-up amendments.
The scale behind the decision is considerable. According to European Commission figures from 2025, more than 2.6 million workers are exposed to the substances concerned. The Council projects that the new rules will prevent roughly 1,700 cases of lung cancer over the next 40 years, along with about 19,000 other illnesses.
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Binding limits for four substances
Alongside the classification of welding fumes, the revised directive sets mandatory occupational exposure limits for several chemical agents, measured over an eight-hour reference period:
- Cobalt: respirable cobalt dust is capped at 0.01 mg/m³, with 0.0025 mg/m³ for the inhalable fraction. Transitional values of 0.02 mg/m³ (respirable) and 0.0042 mg/m³ (inhalable) apply for six years.
- Polycyclic aromatic hydrocarbons (PAHs): a limit of 0.00007 mg/m³, measured as benzo[a]pyrene. In listed sectors, a transitional value of 0.00014 mg/m³ applies for seven years.
- 1,4-Dioxane: an occupational exposure limit of 7.3 mg/m³, plus a short-term value of 73 mg/m³ over 15 minutes and a biological limit of 45 mg HEAA per gram of creatinine.
- Isoprene: a limit set at 8.5 mg/m³ (3 ppm).
German rules will need reworking
Several of the new European values sit below the limits currently applied in Germany, meaning national technical rules will have to be adjusted. Under the Technical Rules for Hazardous Substances (TRGS 900, as of May 2026), Germany's limit for respirable cobalt dust is 0.020 mg/m³ — above the new EU target of 0.01 mg/m³. For the inhalable cobalt fraction, German provisions currently contain no separate value at all.
Other substances diverge as well. TRGS 900 (as of March 2023) lists 1,4-Dioxane at 73 mg/m³, a figure classified as not health-based. For isoprene, the German limit under TRGS 900 (as of July 2013) stands at 8.4 mg/m³ (3 ppm).
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How the measure became law
A provisional agreement reached on 23 June 2026 paved the way for the Council's formal adoption. The European Parliament had already backed the revision on 6 October 2026, voting 499 in favour, 49 against and 104 abstentions.
The revised directive enters into force 20 days after publication in the Official Journal of the European Union. Member states then have two years from that point to transpose the new limits and requirements into national law.
