Associate Safety Professional Practice Exam

What does TLV-STEL stand for?

1. Threshold Limit Value for a Long exposure

2. Short-term exposure limit not to be exceeded

3. Time Limited Value for Safety

4. Temporary Limit Value Safe for Workers

The correct answer is: Short-term exposure limit not to be exceeded

TLV-STEL stands for "Threshold Limit Value - Short Term Exposure Limit." It refers to the maximum concentration of a chemical substance in the air that workers can be exposed to for a short period, typically 15 minutes, without experiencing harmful effects. This value is critical for ensuring worker safety in environments where there may be intermittent exposures to hazardous substances. The concept behind TLV-STEL is to protect workers from acute effects that may result from short-term exposure to high levels of toxic substances, which can occur even if the long-term exposure (represented by the TLV-TWA, or Time-Weighted Average) is below the acceptable limit. Thus, this choice accurately describes the intention and application of TLV-STEL in occupational health standards.