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Title 30: Mineral Resources
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
: Air Quality-Underground Only
57.5015 - Oxygen deficiency.
Air in all active workings shall contain at least 19.5 volume percent oxygen.
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