What is the exposure time for the TLV-STEL?

What is the exposure time for the TLV-STEL?

• A. 5 minutes
• B. 15 minutes
• C. 30 minutes
• D. 60 minutes

Answer: (B)

The short-term exposure limit is defined over a 15-minute window. TLV-STEL stands for Threshold Limit Value - Short-Term Exposure Limit, and it sets the maximum concentration a worker can be exposed to for a brief period without experiencing acute health effects. This is different from TLV-TWA, which is averaged over an 8-hour work period to protect against longer-term effects. When multiple short exposures are allowed, each exposure lasts 15 minutes, with at least 60 minutes between exposures and no more than four STEL exposures per day. So the exposure time for the TLV-STEL is 15 minutes.

The short-term exposure limit is defined over a 15-minute window. TLV-STEL stands for Threshold Limit Value - Short-Term Exposure Limit, and it sets the maximum concentration a worker can be exposed to for a brief period without experiencing acute health effects. This is different from TLV-TWA, which is averaged over an 8-hour work period to protect against longer-term effects. When multiple short exposures are allowed, each exposure lasts 15 minutes, with at least 60 minutes between exposures and no more than four STEL exposures per day. So the exposure time for the TLV-STEL is 15 minutes.