Although they do not cover every substance that is used in the workplace, occupational exposure limits (OELs) are an important tool for risk assessment and management, and provide valuable information for health and safety activities concerning hazardous substances. Employers must ensure that the exposure of employees to substances does not exceed national limits.

This topic describes what occupational exposure limits are, how to monitor exposure in the workplace, and what action needs to be taken if they are exceeded.

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