California Labor Code
§ 7979
LAB § 7979Div. 5 · Part 9 · Ch. 2
Statute text
View on leginfo.ca.govIn 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.
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Legislative history
Added by Stats. 1972, Ch. 1430.