How long can TLV-STEL last for exposure periods?

The Time-Weighted Average Short-Term Exposure Limit (TLV-STEL) is designed to protect workers from acute effects of exposure to hazardous substances. A TLV-STEL is typically a 15-minute exposure limit that should not be exceeded during any 15-minute period within the workday. This limit is important because it allows for short bursts of higher exposure, which can occur due to processes that involve abrupt releases of hazardous materials or tasks that increase exposure levels temporarily.

This specific duration of 15 minutes is established to minimize the risk of potential adverse health effects linked to short-term exposures, ensuring that workers are not subjected to hazardous conditions beyond what is considered safe for brief intervals. The establishment of this limit also highlights the importance of monitoring and managing exposure levels in real-time, allowing for immediate corrective actions if the TLV-STEL is approached or exceeded.