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Standard Interpretations
06/30/1976 - Allowable Airborne Concentrations of Mercury.
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• Standard Number: 1910.1000

June 30, 1976

MEMORANDUM FOR: OSHA REGIONAL ADMINISTRATORS
FROM: MORTON CORN
Assistant Secretary of Labor
SUBJECT: Interpretation of Allowable Airborne Concentrations of Mercury

29 CFR 1910.1000, Table Z-2 contains the ceiling value for mercury. Historically the values in this table relate to the maximum allowable concentrations defined by ANSI as 8 hour time-weighted average.

Therefore, the allowable airborne concentration of mercury shall be interpreted as 0.1 mg/m(3) as determined on the basis of the full shift time-weighted average.

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