Cal. Lab. Code § 7979

Current through the 2023 Legislative Session.

Section 7979 - Air supply in extrahazardous tunnel or mine

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.

Ca. Lab. Code § 7979

Added by Stats. 1972, Ch. 1430.