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1910.1000(a) Table Z-1
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1910.1000(a)(1) Substances With Limits Preceded by "C"—Ceiling Values
An employee's exposure to any substance in Table Z-1, the exposure limit of which is preceded by a "C", shall at no time exceed the exposure limit given for that substance. If instantaneous monitoring is not feasible, then the ceiling shall be assessed as a 15-minute time weighted average exposure which shall not be exceeded at any time during the working day.
1910.1000(a)(2) Other Substances—8-Hour Time Weighted Averages
An employee's exposure to any substance in Table Z-1, the exposure limit of which is not preceded by a "C", shall not exceed the 8-hour Time Weighted Average given for that substance in any 8-hour work shift of a 40-hour work week.
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