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 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES › Subpart D—Air Quality and Physical Agents

30 C.F.R. § 56.5002

Exposure monitoring

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Dust, gas, mist, and fume surveys shall be conducted as frequently as necessary to determine the adequacy of control measures.