Permissible Exposure Limit
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The Permissible Exposure Limit (PEL or OSHA PEL) is a legal limit in the United States for personal exposure to a substance, usually expressed in parts per million (ppm), or sometimes in milligrams per cubic metre (mg/m3). Permissible Exposure Limits are defined by the Occupational Safety and Health Administration (OSHA).
Exposure is defined as a time-weighted average, usually abreviated to TWA. This means that, for limited periods, a worker may be exposed to concentrations which are higher than the PEL, so long as the average concentration over eight hours remains lower.
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External link
- OSHA Permissible Exposure Limits site (includes list of PEL values, and legal references)