Oklahoma v. Environmental Protection Agency
U.S. Supreme Court · decided June 18, 2025 · Supreme Court Database (Spaeth)
- Decided
- June 18, 2025
- Term
- October Term 2024
- Vote
- 8–0
- Majority author
- Justice Thomas
- Issue area
- Judicial Power
- Disposition
- Reversed and remanded
- Outcome
- Petitioning party won
- Ideological direction
- Conservative
Opinion excerpt
PRELIMINARY PRINT Volume 605 U. S. Part 2 Pages 609–626 OFFICIAL REPORTS OF THE SUPREME COURT June 18, 2025 Page Proof Pending Publication REBECCA A. WOMELDORF reporter of decisions NOTICE: This preliminary print is subject to formal revision before the bound volume is published. Users are requested to notify the Reporter of Decisions, Supreme Court of the United States, Washington, D. C. 20543, pio@supremecourt.gov, of any typographical or other formal errors. OCTOBER TERM, 2024 609 Syllabus OKLAHOMA et al. v. ENVIRONMENTAL PROTECTION AGENCY et al. certiorari to the united states court of appeals for the tenth circuit No. 23–1067. Argued March 25, 2025—Decided June 18, 2025* The Clean Air Act (CAA) channels challenges to Environmental Protec- tion Agency (EPA) actions to the U. S. Court of Appeals for the D. C. Circuit if the actions are “nationally applicable,” and to a regional Circuit if they are “locally or regionally applicable.” 42 U. S. C. § 7607(b)(1). The CAA contains an exception for certain “locally or re- gionally applicable” actions “based on a determination of nationwide scope or effect,” which also must be brought in the D. C. Circuit. Ibid. In 2015, EPA revised the national ambient air quality standards (NAAQS) for ozone to be more stringent. Each State submitted a state implementation plan (SIP) detailing how it would comply with the CAA's “Good Neighbor”…
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