{"data":{"id":"us/30-cfr-57.22231","jurisdiction":"us","citation":"30 CFR 57.22231","heading":"Actions at 0.25 percent methane (I-B, II-B, V-B, and VI mines).","body":"If methane reaches 0.25 percent in the mine atmosphere, changes shall be made to improve ventilation, and MSHA shall be notified immediately.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES","Subpart T—Safety Standards for Methane in Metal and Nonmetal Mines"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"1558f80f180f783592a81bc7d87967dc281f1059e2426041a14c7136a6984e41","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.22230","next":"us/30-cfr-57.22232"},"notice":"GroundRules: Original legal text. Not legal advice."}