CFR›Title 40›Chapter I›Part 54 ContainsSections 54.1–54.3CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 54—PRIOR NOTICE OF CITIZEN SUITS Sections 54.1 § 54.1 Purpose. 54.2 § 54.2 Service of notice. 54.3 § 54.3 Contents of notice. AuthoritySec. 304 of the Clean Air Act, as amended (sec. 12, Pub. L. 91-604, 84 Stat. 1706).Source36 FR 23386, Dec. 9, 1971, unless otherwise noted. Previous 53 Part 53—Ambient Air Monitoring Reference and Equivalent Methods Next 55 Part 55—Outer Continental Shelf Air Regulations