30 CFR Part 57Public Domain
§ 57.5015 — Oxygen deficiency
Subpart D — Air Quality, Radiation, Physical Agents, and Diesel Particulate Matter
Air in all active workings shall contain at least 19.5 volume percent oxygen.
Public Domain: 30 CFR Part 57 (MSHA Safety and Health Standards — Underground Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.