U.S. High Court Says States’ CAA Plans Can Be Reviewed In Regional Circuit Courts

( June 18, 2025, 1:48 PM EDT) -- WASHINGTON, D.C. — The U.S. Supreme Court on June 18 reversed and remanded a case over the proper venue to hear challenges to the U.S. Environmental Protection Agency’s disapproval of state implementation plans (SIPs) for new air quality standards under the Clean Air Act (CAA). The court held that the SIPs filed by the states of Oklahoma and Utah are locally or regionally applicable actions reviewable in a regional circuit court....

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