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30 C.F.R. § 57.5015 – Oxygen deficiency. | Midpage
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Code of Federal Regulations
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Part 57
Subpart D
ECFRccea3c6ac9aad2c
§ 57.5015
30 C.F.R. § 57.5015
Oxygen deficiency.
Air in all active workings shall contain at least 19.5 volume percent oxygen.