Which of the following is the STEL (Short-Term Exposure Limit) for anhydrous ammonia according to ACGIH?

The Short-Term Exposure Limit (STEL) for anhydrous ammonia, as defined by the American Conference of Governmental and Industrial Hygienists (ACGIH), is established to protect workers from acute effects that may occur due to short-term exposures. ACGIH recommends a STEL of 27 mg/m3 for anhydrous ammonia, which highlights the specific threshold exposure that should not be exceeded during a short duration, typically 15 minutes.

This limit is critical as it is aimed at preventing immediate or serious health effects from exposure, which can occur even at concentrations that are not dangerous for longer-term exposure. The emphasis on maintaining this limit is crucial in environments where ammonia is used or processed, as it facilitates safe working conditions, thereby reducing the risk of occupational health issues.