US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 98 — MANDATORY GREENHOUSE GAS REPORTINGSubpart FF — Underground Coal Mines98.32140 C.F.R. § 98.321Reporting threshold.Last amended: 2017Year: 2026Length: 26 wordsOfficial source Cite as 40 C.F.R. § 98.321 (2026)You must report GHG emissions under this subpart if your facility contains an active underground coal mine and the facility meets the requirements of § 98.2(a)(1).Cross-references to the CFR98.2Previous40 C.F.R. § 98.320Next40 C.F.R. § 98.322