Occupational exposure limit
（重定向自Occupational exposure limits）
![Simple representation of exposure risk assessment and management hierarchy based on available information](/Images/godic/202501/30/Hierarchies_of_Exposure_Assessment_and_Management0215.JPG")
![Hierarchy of occupational exposure limits (OELs)](/Images/godic/202501/30/Hierarchy_of_Occupational_Exposure_Limits0215.JPG")
![Illustration of statistical output from IHSTAT using air sampling data](/Images/godic/202501/30/Analysis_of_air_sampling_data_using_IHSTAT0215.JPG")
An occupational exposure limit is an upper limit on the acceptable concentration of a hazardous substance in workplace air for a particular material or class of materials. It is typically set by competent national authorities and enforced by legislation to protect occupational safety and health. It is an important tool in risk assessment and in the management of activities involving handling of dangerous substances. There are many dangerous substances for which there are no formal occupational exposure limits. In these cases, hazard banding or control banding strategies can be used to ensure safe handling.