Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) are guidelines that help industrial hygienists determine safe exposure levels to chemical substances and physical agents in the workplace:
Purpose
TLVs and BEIs are health-based values that help control health hazards. They are not legal standards, but can be used as a supplement to occupational safety and health programs.
How they are developed
TLVs and BEIs are established by committees that review scientific literature in fields like industrial hygiene, toxicology, and epidemiology.
How they are used
Industrial hygienists use TLVs and BEIs to make decisions about safe exposure levels, but they are only one factor to consider in a given situation.
What they represent
TLVs represent the maximum average airborne concentration of a hazardous material that healthy adult workers can be exposed to without significant adverse health effects.
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