What are OSHA exposure limits?

Exposure limits OSHA establishes—called Permissible Exposure Limits (PELs)—define the maximum amount of a specific contaminant workers may be exposed to during a specified timeframe, typically an eight-hour shift. OSHA has PELs for many industrial contaminants, including welding fumes, silica dust, hexavalent chromium, lead and oil mist. Exposure limits vary by substance and industry.