Statute · California Labor Code
Cal. Lab. Code § 7979 — Gassy and Extrahazardous Tunnels
Cal. Lab. Code § 7979
- Type
- Statute
- Source
- California Labor Code
- Jurisdiction
- California
- Current through
- Nov 2, 2026 (California Legislative Counsel)
In tunnels or underground mines classified extrahazardous, sufficient air shall be supplied to maintain an atmosphere of all of the following conditions:
Citator
Cal. Lab. Code § 7979 — Gassy and Extrahazardous Tunnels is in force in the current edition of the Code, and nothing recorded condemns it.
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.