OEHHA Notice of Intent to list “welding fumes” as a carcinogen under the Labor Code mechanism; public comment open May 8–June 8, 2026

OEHHA issued a Notice of Intent to list “welding fumes” as a chemical known to the State of California to cause cancer under Proposition 65, using the Labor Code listing mechanism (ministerial listing pathway). OEHHA opened a public comment period running from May 8, 2026 through June 8, 2026. If finalized, the listing would require companies with relevant products/operations (e.g., welding processes, fabricated metal products, equipment, workplace exposures) to assess whether exposures are “significant” and whether Proposition 65 warnings or other risk management actions are needed.