US lawFederal (United States)RegulationsTitle 40 CFR — Protection of EnvironmentChapter I — ENVIRONMENTAL PROTECTION AGENCYPart 49 — INDIAN COUNTRY: AIR QUALITY PLANNING AND MANAGEMENTSubpart M — Implementation Plans for Tribes—Region X49.989240 C.F.R. § 49.9892Approval status.Last amended: 2016Year: 2026Length: 17 wordsOfficial source Cite as 40 C.F.R. § 49.9892 (2026)There are currently no EPA-approved Tribal rules or measures in the implementation plan for the Chehalis Reservation.Previous40 C.F.R. § 49.9891Next40 C.F.R. § 49.9895