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Regulations last checked for updates: Oct 02, 2026
Title 40 - Protection of Environment last revised: Sep 29, 2026
All Titles
Title 40
Chapter I
Part 66
Subpart A - Subpart A—Purpose and Scope
§ 66.1 - Applicability and effective date.
§ 66.2 - Program description.
§ 66.3 - Definitions.
§ 66.4 - Limitation on review of regulations.
§ 66.5 - Savings clause.
§ 66.6 - Effect of litigation; time limits.
authority:
Sec. 120, Clean Air Act, as amended,
42 U.S.C. 7420.
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