C.F.R. » Title 30 » CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR › SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH › PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES › Subpart D—Air Quality, Radiation, Physical Agents, and Diesel Particulate Matter

30 C.F.R. § 57.5038

Annual exposure limits

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No person shall be permitted to receive an exposure in excess of 4 WLM in any calendar year.