he U.S. Supreme Court, 8-0, held that EPA's disapprovals of Oklahoma's and Utah's SIPs were locally or regionally applicable actions reviewable in a regional circuit court.

The U.S. Supreme Court, 7-2, held that EPA's 2022 denials of six small refinery exemption petitions were locally or regionally applicable actions that fell within the "nationwide scope or effect" exception under the CAA, requiring venue in the D.C. Circuit.

The U.S. Supreme Court, 7-2, held that several fuel producers had standing in a lawsuit challenging EPA's approval of California regulations requiring automakers to manufacture more electric vehicles and fewer gasoline-powered vehicles in an effort to decrease emissions from liquid fuels.

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In a per curiam decision, the D.C. Circuit, 2-1, granted environmental groups' challenge to an EPA rule implementing Renewable Fuel Standards (RFS) Program standards for 2023-2025.

The Third Circuit affirmed a district court order remanding to state court a lawsuit concerning a chemical company's design, manufacture, marketing, and sale of 1,4-dioxane.

The Fifth Circuit granted industry groups' challenge to EPA's 2024 rule that revised the equation for calculating vehicle fuel economy for purposes of the Corporate Average Fuel Economy (CAFE) standards and required manufacturers to certify fuel economy using E10 test fuel, containing&a

The Ninth Circuit affirmed in part and reversed in part summary judgment for BLM in challenges to approval of an oil and gas project in the northern Arctic.

The Ninth Circuit granted in part environmental groups' petition to review EPA's decision refusing to revise technology-based effluent limits, guidelines, and standards (ELGs) for certain industries previously promulgated under the CWA.

The Ninth Circuit affirmed in part and reversed in part summary judgment for BLM in challenges to approval of an oil and gas project in the northern Arctic.