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1910.1000(b) Table Z-2
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1910.1000(b)(1) 8-Hour Time Weighted Averages
1910.1000(b)(2) Acceptable Ceiling Concentrations
An employee's exposure to a substance listed in Table Z-2 shall not exceed at any time during an 8-hour shift the acceptable ceiling concentration limit given for the substance in the table, except for a time period, and up to a concentration not exceeding the maximum duration and concentration allowed in the column under "acceptable maximum peak above the acceptable ceiling concentration for an 8-hour shift."
During an 8-hour work shift, an employee may be exposed to a concentration of Substance A (with a 10 ppm TWA, 25 ppm ceiling and 50 ppm peak) above 25 ppm (but never above 50 ppm) only for a maximum period of 10 minutes. Such exposure must be compensated by exposures to concentrations less than 10 ppm so that the cumulative exposure for the entire 8-hour work shift does not exceed a weighted average of 10 ppm.
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1910.1000(b) Toxic and Hazardous Substances, Table Z-2
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1910.1000(d)(1)(ii) Toxic and Hazardous Substances,
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