Code of Federal Regulations · Section

§ 57.5039 — Maximum Permissible Concentration

30 C.F.R. § 57.5039

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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.

30 C.F.R. § 57.5038 30 C.F.R. § 57.5040

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