Question 3218 Deck General

The correct answer is B) 20 ppm. The Occupational Safety and Health Administration (OSHA) has set the permissible exposure limit (PEL) for hydrogen sulfide (H2S) at 20 ppm as a ceiling concentration, meaning workers should not be regularly exposed to levels above 20 ppm. This limit is based on the potential for H2S to cause respiratory paralysis and death at higher concentrations. The other options are incorrect because 10 ppm is below the OSHA PEL, while 40 ppm and 80 ppm exceed the PEL and would be considered hazardous levels of exposure.