CFR›Title 40›Chapter I›Part 51›Subpart M ContainsSubject group Agency DesignationCorpusDaily eCFRDisplayed edition2026-04-27Last updated2026-04-27 Subpart M—Intergovernmental Consultation Subject Groups Agency Designation Agency Designation Sections 51.240–51.242 AuthoritySecs. 110, 121, 174(a), 301(a), Clean Air Act, as amended (42 U.S.C. 7410, 7421, 7504, and 7601(a)).Source44 FR 35179, June 18, 1979, unless otherwise noted. Previous K Subpart K—Source Surveillance Next N Subpart N—Compliance Schedules