Occupational Exposure Limit

A generic term used to represent a pair of numbers: (1) the agent concentration or intensity that is allowable (based on health-effects data) and (2) the time period over which one averages workplace concentrations to evaluated whether the measured concentrations are less than the allowable limit. Some substances may have several occupational exposure limits (e.g., one for eight hours, one for 30 minutes, and a not-to-exceed ceiling).