Regulations last checked for updates: Nov 24, 2024

Title 40 - Protection of Environment last revised: Nov 21, 2024
authority: Sec. 304 of the Clean Air Act, as amended (sec. 12, Pub. L. 91-604, 84 Stat. 1706)
source: 36 FR 23386, Dec. 9, 1971, unless otherwise noted.