MSHA - Code of Federal Regulations - 30 CFR 57.5042
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MSHA - Title 30 CFR
30 CFR § 57.5042
Revised exposure levels.

If levels of permissible exposures to concentrations of radon daughters different from those prescribed in 57.5038 are recommended by the Environmental Protection Agency and approved by the President, no employee shall be permitted to receive exposures in excess of those levels after the effective dates established by the Agency.