30 CFR 57.22220
§ 57.22220 Air passing unsealed areas (I-A, II-A, III, and V-A mines).
United States · 30 CFR — Mineral Resources · Status: effective
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- Citation
- 30 CFR 57.22220, § 57.22220 Air passing unsealed areas (I-A, II-A, III, and V-A mines), United States, version 1 as recorded 2026-07-09, yourstate.us, https://yourstate.us/provision/133246
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Full text
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.
Legislative history
This is a federal regulation, adopted through agency rulemaking under the Administrative Procedure Act — not enacted by a recorded vote of Congress.