What does the permissible exposure level (PEL) refer to in an occupational context?

The permissible exposure level (PEL) refers to the maximum allowable concentration of a hazardous substance in the workplace air, as established by regulatory agencies such as the Occupational Safety and Health Administration (OSHA). PELs are designed to protect workers from the effects of exposure to toxic substances, ensuring that the levels of exposure remain within safe limits during the course of their work. This standard is critical for assessing workplace safety and for the implementation of control measures to protect employees' health.

Choosing the correct option reflects an understanding of workplace safety regulations and the importance of monitoring hazardous substances to maintain a safe working environment. The other choices relate to other aspects of occupational safety but do not accurately define what PEL specifically refers to.