---
kind: "section"
citation: "30 C.F.R. § 57.22220"
title: "30"
number: "57.22220"
heading: "Air passing unsealed areas (I-A, II-A, III, and V-A mines)."
url: "https://uscodex.org/cfr/30/57.22220"
---

# §57.22220. Air passing unsealed areas (I-A, II-A, III, and V-A mines).


Air that has passed by or through unsealed abandoned or unsealed inactive areas and contains 0.25 percent or more methane shall—

- (a) Be coursed directly to a return airway;
- (b) Be tested daily for methane by a competent person; and
- (c) **Not be used to ventilate work places.**

## 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.