Ontario Regulation 833 sets legally enforceable occupational exposure limits (OELs) for airborne chemical and biological agents under the Occupational Health and Safety Act and outlines employer duties to assess, control, and monitor worker exposures. It covers exposure assessment, engineered and administrative controls, PPE and respirator requirements, training, and recordkeeping to protect workers across industries where hazardous agents are present.

In Ontario, many workplaces use chemical and biological products or create contaminants —from cleaning products and solvents to welding fumes and laboratory samples during work.

Under the Occupational Health and Safety Act (OHSA), employers must protect workers from harmful exposure to these substances.

Ontario Regulation 833 – Control of Exposure to Biological or Chemical Agents sets legal exposure limits for airborne chemical agents and describes how employers must control workers’ exposure to hazardous biological or chemical agents in the workplace.

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