Regulations last checked for updates: Dec 19, 2025

Title 40 - Protection of Environment last revised: Nov 19, 2028
All TitlesTitle 40Chapter IPart 51Subpart A - Subpart A—Air Emissions Reporting Requirements
authority: 23 U.S.C. 101; 42 U.S.C. 7401-7671q.
source: 36 FR 22398, Nov. 25, 1971, unless otherwise noted.
cite as: 40 CFR 51.10
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