Regulations last checked for updates: May 01, 2025

Title 40 - Protection of Environment last revised: Nov 01, 2025
All TitlesTitle 40Chapter IPart 81Subpart E - Subpart E—Identification of Interstate Transport Regions
View all text of Subpart E [§ 81.455 - § 81.457]
§ 81.455 - Scope.

This subpart identifies interstate transport regions established for national ambient air quality standards pursuant to section 184 or section 176A of the Clean Air Act.

authority: 42 U.S.C. 7401,
source: 36 FR 22421, Nov. 25, 1971, unless otherwise noted.
cite as: 40 CFR 81.455
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