What is OSHA's standard for hydrogen sulfide (H2S) exposure?

The correct exposure standard for hydrogen sulfide (H2S) set by OSHA is 20 ppm (parts per million) as a permissible exposure limit (PEL) for an 8-hour workday. This standard is established to protect workers from the toxic effects of H2S, which can cause serious health issues, including respiratory problems and even death at high concentrations.

While lower concentrations may be less immediately hazardous, the 20 ppm standard provides a critical balance between ensuring worker safety and allowing for necessary industrial operations where the handling of H2S may occur. Being aware of this limit is essential for anyone working in environments where hydrogen sulfide is present, as exceeding the threshold can increase the risk of acute exposure and adverse health effects.