What is the permissible exposure limit (PEL) for benzene?

The permissible exposure limit (PEL) for benzene is set at 1 part per million (ppm) as an eight-hour time-weighted average in occupational settings. This limit is established to protect workers from the harmful effects of benzene, which is recognized as a carcinogen and poses significant health risks even at low concentrations.

By defining the PEL at 1 ppm, regulatory agencies aim to reduce the exposure to benzene to an acceptable level, thus minimizing risks such as cancer and other adverse health effects associated with prolonged exposure. The choice of 1 ppm reflects the compound's toxicity and the need for stringent control measures in environments where benzene is present, such as chemical manufacturing, oil refining, and other industries that utilize or produce this substance.

Other options present higher limits that do not align with established safety guidelines for benzene exposure, as they would fail to adequately protect workers’ health over sustained periods of exposure.