Exposure Values 2
Exposure Values 2 : The airborne concentrations of a biological, chemical, or physical agent to which it is believed nearly all workers may be exposed without experiencing any harmful effects. (1) Time Weighted Average Exposure Value (TWAEV): The time weighted average concentration or levels of a chemical or biological agent for an 8-hour day or a 40-hour week to which it is believed nearly all workers may be exposed, day after day, without experiencing harmful effects. (2) Short-Term Exposure Value (STEV): The maximum airborne concentration of a chemical, biological or physical agent to which workers may be exposed from time to time, provided that the exposure is for not more than 15 minutes, is not more often than four times in a work day, and at least 60 minutes have elapsed from the time of the last exposure. (3) Ceiling Exposure Value (CEV): The maximum exposure to an airborne concentration of a chemical, biological or physical agent that is not to be exceeded for any length of time. Note: Recommended exposure values established by ACGIH are known as Threshold Exposure Values. See: Threshold Limit Values
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