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Exposure Limit

Definition - What does Exposure Limit mean?

An exposure limit is an upper or lower level or legal limit used as a safety measure to prevent health and safety risks that may be caused by too much exposure to a toxic or unsafe substance. Exposure limits are simply the boundaries that are defined for substances that present a threat to human life and/or health. Exposure limits vary based on the substance in question and the work environment in which it's being used.

Safeopedia explains Exposure Limit

There are a few different types of exposure limits:

  • Time-Weighted Exposure Value: An average exposure value that is generally calculated over an eight-hour day or 40-hour work week.
  • Short-Term Exposure Limit: The maximum value of airborne contaminants, biological or chemical agents to which a worker can safely be exposed for 15-30 minutes at a time.
  • Ceiling Exposure Limit: The concentration or highest level of exposure to a substance or hazard that is considered safe, and may not be exceeded at any point during the work day.



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