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Regulations last checked for updates: Jan 18, 2025
Title 40 - Protection of Environment last revised: Dec 30, 2025
All Titles
Title 40
Chapter I
Part 81
Subpart E - Subpart E—Identification of Interstate Transport Regions
§ 81.455 - Scope.
§ 81.457 - Ozone Transport Region.
Appendix Appendix A - Appendix A to Part 81—Air Quality Control Regions (AQCR's)
authority:
42 U.S.C. 7401
,
source:
36 FR 22421, Nov. 25, 1971, unless otherwise noted.
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