Teleforum

On June 18, 2025, the Supreme Court released its decisions for two circuit splits arising under the Clean Air Act (CAA) provision regarding judicial venue: EPA v. Calumet Shreveport Refining, L.L.C. (23-1229), and Oklahoma v. EPA (23-1067). Decided 7-2 and 8-0, respectively, the outcome of these cases hinged on the Court’s interpretation of the CAA’s unique venue provision, 42 U.S.C. § 7607(b)(1). The CAA states that challenges to “nationally applicable” actions may be filed only in the D.C. Circuit. 42 U.S.C. § 7607(b)(1). Conversely, challenges to CAA actions that are “locally or regionally applicable” may generally be filed only in the appropriate circuit court for the region. Id. But there is an exception: actions that are “based on a determination of nationwide scope or effect” must be filed in the D.C. Circuit “if in taking such action the Administrator finds and publishes that such action is based on such a determination.” Id.In Calu