Which statement about PEL is true?

• A. It is higher than TLV/TWA for all chemicals
• B. It is the OSHA standard and is the same as TLV/TWA in terms of 8-hour, 40-hour exposure
• C. It is a ceiling limit
• D. It does not apply to hazardous chemicals

Answer: (B)

Permissible Exposure Limit (PEL) is the maximum amount of a hazardous chemical a worker can be exposed to under OSHA rules, based on an 8-hour workday and a 40-hour workweek (an 8-hour time-weighted average). It is an enforceable standard. In practice, many PEL values were historically derived from the TLV-TWA values set by the ACGIH, so for an 8-hour exposure the numbers often line up, making the PEL effectively the same as the TLV-TWA in this context. The TLV/TWA is a guideline, not an enforceable regulation, but it uses the same 8-hour averaging concept, which is why they align here. The other statements aren’t correct: PELs are not universally higher than TLV/TWA for all chemicals; a PEL is not a ceiling limit (that role belongs to STEL/ceiling limits); and PEL does apply to hazardous chemicals.