---
kind: "section"
citation: "30 C.F.R. § 57.22231"
title: "30"
number: "57.22231"
heading: "Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines)."
url: "https://uscodex.org/cfr/30/57.22231"
---

# §57.22231. Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).


If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately.


## Notes

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 52 FR 24941, July 1, 1987, unless otherwise noted.

### Authority

Authority: 30 U.S.C. 811.

### Source

Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.