OEHHA issues Notice of Intent to list “welding fumes” as a carcinogen under Proposition 65 (Labor Code mechanism) and opens public comment period

OEHHA published a Notice of Intent (NOI) indicating it intends to list “welding fumes” as a chemical known to the State of California to cause cancer using the Labor Code mechanism incorporated into Proposition 65. OEHHA opened a public comment period (comments due by June 8, 2026). If the listing proceeds, businesses involved in activities, products, or workplaces that may result in significant exposures to welding fumes may need to assess exposure scenarios and potential Proposition 65 warning obligations once any listing becomes effective and applicable warning timelines run.