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From Wikipedia, the free encyclopedia. The permissible exposure limit (PEL or OSHA PEL) is a legal limit in the United States for exposure of an employee to a chemical substance or physical agent such as loud noise. Permissible exposure limits are established by the Occupational Safety and Health Administration (OSHA).
A PEL is usually given as a time-weighted average (TWA), although some are short-term exposure limits (STEL) or ceiling limits. A TWA is the average exposure over a specified period, usually a nominal eight hours. OSHA (29 CFR part 1910 subpart Z) sets PELs to protect workers against the health effects of exposure to hazardous substances. The PELs are limits on the amount or concentration of a substance in the air, and they may also contain a skin designation. The basic exposure limits are defined as the concentration of a chemical in air to which nearly all individuals can be exposed without adverse effects for an 8-hour work-day over a 30 year career. The numbers are usually expressed in parts per million (ppm) or mg/m3.