What do the terms TLV and TWA stand for in occupational safety?

The correct interpretation of the terms TLV and TWA in occupational safety is Threshold Limit Value and Time Weighted Average.

Threshold Limit Values (TLVs) are established limits of exposure to various substances or physical agents in the workplace, developed to prevent adverse health effects. These values are determined based on scientific research and are used to guide the safe exposure levels for workers.

Time Weighted Average (TWA) is a method of expressing occupational exposure to a chemical substance over a specified period, typically an 8-hour workday. It considers the varying levels of exposure that might occur throughout the work shift and averages them to ensure that the concentration remains within safe limits over time.

Together, TLV and TWA are crucial for ensuring workplace safety, allowing employers to set guidelines and implement protective measures to minimize potential health hazards from exposure to hazardous substances.