Ontario · O. Reg. 490/09

DESIGNATED SUBSTANCES

Under the Occupational Health and Safety Act

Current version date April 20, 2026 · official source text · watch this law (RSS)

Employment & Workplace

Change history

Ontario · AmendedDate recorded April 20, 2026

Respirator approval rules for designated substances expanded to recognize CSA Group certification

Starting mid-2026, respirators used under Ontario's Designated Substances regulation will be accepted if approved by NIOSH, by the CSA Group (a newly recognized certifier), or by another agency whose protection is jud…

O. Reg. 490/09Employment & WorkplaceHealth CareConstruction & Real Estate+8 / −0 lines