What is the permissible exposure limit (PEL) and how does it apply to employers?

• A. A regulatory limit for workplace exposure established by OSHA.
• B. A guideline for maximum daily intake in the general population.
• C. A recommended exposure limit used only for research facilities.
• D. A regulatory limit for workplace exposure established by OSHA; employers must ensure exposures do not exceed the PEL.

Answer: (D)

A permissible exposure limit is a regulatory limit set by OSHA that specifies the maximum amount or concentration of a hazardous agent a worker can be exposed to during a defined period, typically an 8-hour workday or a 40-hour week. This limit is enforceable, not just a suggestion, so employers must actively keep actual exposures at or below the PEL through controls such as ventilation, work practice changes, scheduling, monitoring, and the use of personal protective equipment. If monitoring shows exposures approaching or exceeding the limit, steps must be taken to reduce exposure and, in some cases, implement medical surveillance or other protections. The other options fail because the PEL is not a guideline for the general population, not restricted to research facilities, and it is not merely a general statement without the employer’s obligation to maintain exposure below the limit.