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U.S. Department of Labor Mine Safety and Health Administration Protecting Miners' Safety and Health Since 1978 |
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www.msha.gov |  |
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30 CFR § 57.5039
Maximum permissible concentration.
Except as provided by standard §57.5005, persons shall
not be exposed to air containing concentrations of radon daughters exceeding
1.0 WL in active workings. For further information: See MSHA's Program Policy Manual |