What is the term for the 15-minute exposure limit that should not be exceeded more than 40 times daily?

The term for the 15-minute exposure limit that should not be exceeded more than 40 times daily is known as the "short-term exposure limit" (STEL). It is part of the threshold limit values established to protect workers from health hazards associated with brief, intense chemical exposure.

STEL values are designed to limit exposure to hazardous substances over short durations, recognizing that some chemicals can cause acute effects from short-term exposure even at lower concentrations. By capping the exposure to a maximum level over a 15-minute interval, this standard helps ensure that workers are not subjected to harmful concentrations that could result in immediate health effects.

This understanding is crucial for maintaining workplace safety and adhering to industry standards for hazardous materials. The other terms, while related to exposure limits, do not specifically refer to the 15-minute interval and frequency parameters that define the STEL.