Which term describes a ceiling limit that should never be exceeded?

Which term describes a ceiling limit that should never be exceeded?

• A. TLV/C
• B. TLV/TWA
• C. TLV/STEL
• D. PEL

Answer: (A)

The term is TLV/C. It stands for Threshold Limit Value ceiling, and it represents the concentration that should never be exceeded at any time during any part of the exposure. The ceiling value is a hard cap to prevent acute overexposure. TLV/TWA describes an average exposure over a work shift, which can be below the ceiling as long as the average stays under the limit. TLV/STEL is a short-term exposure limit, typically for a 15-minute period, not to be exceeded within any 15-minute interval. PEL is the permissible exposure limit set by regulatory authorities, which is a legal limit rather than the TLV ceiling concept.

The term is TLV/C. It stands for Threshold Limit Value ceiling, and it represents the concentration that should never be exceeded at any time during any part of the exposure. The ceiling value is a hard cap to prevent acute overexposure.

TLV/TWA describes an average exposure over a work shift, which can be below the ceiling as long as the average stays under the limit. TLV/STEL is a short-term exposure limit, typically for a 15-minute period, not to be exceeded within any 15-minute interval. PEL is the permissible exposure limit set by regulatory authorities, which is a legal limit rather than the TLV ceiling concept.