In tunnels or underground mines classified extrahazardous, sufficient air shall be supplied to maintain an atmosphere of all of the following conditions: (a) Not less than 19 percent oxygen. (b) Not more than 0.5 percent carbon dioxide. (c) Not more than 5 parts per million nitrogen dioxide. (d) No petroleum vapors or other toxic gases in concentrations exceeding the threshold limit values established annually by the American Conference of Governmental Industrial Hygienists.
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