Which of the following is true regarding benzene PEL-TWA values?

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Multiple Choice

Which of the following is true regarding benzene PEL-TWA values?

The key idea is the time-weighted average exposure limit for benzene, known as the PEL-TWA. For benzene, the permissible average over an 8-hour work shift is 1 part per million. This reflects the need to limit sustained exposure because benzene is a carcinogen, so the standard sets a conservative long-term limit. The value of 1 ppm is the correct one for the PEL-TWA. The other numbers relate to short-term exposure limits (for example, 5 ppm is a STEL, not the 8-hour average) or higher limits that don’t apply to benzene’s PEL-TWA, and saying there is no limit is incorrect.

The key idea is the time-weighted average exposure limit for benzene, known as the PEL-TWA. For benzene, the permissible average over an 8-hour work shift is 1 part per million. This reflects the need to limit sustained exposure because benzene is a carcinogen, so the standard sets a conservative long-term limit.

The value of 1 ppm is the correct one for the PEL-TWA. The other numbers relate to short-term exposure limits (for example, 5 ppm is a STEL, not the 8-hour average) or higher limits that don’t apply to benzene’s PEL-TWA, and saying there is no limit is incorrect.

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