There are various types of exposure limits, including:
Time-Weighted Average (TWA): This is the average concentration of a substance in the air over a typical 8-hour workday. Short-Term Exposure Limit (STEL): The maximum concentration to which workers can be exposed for a short period (usually 15 minutes) without suffering from irritation, chronic or irreversible tissue damage, or narcosis. Ceiling Limit (C): This limit should not be exceeded at any time during the workday.
