In a per curiam opinion, the D.C. Circuit dismissed in part and denied in part challenges to EPA's 2022 denial of pending Renewable Fuel Standard (RFS) exemption petitions filed by small…

The D.C. Circuit denied a chemical manufacturer's and two trade groups' petitions to review EPA's 2020 rule regulating emissions from miscellaneous organic chemical manufacturing…

The D.C. Circuit denied a petition to review EPA's 2023 regulations that imposed new reporting requirements on biogas producers. An industry group argued, among other things, that EPA had no…

In a per curiam order, the D.C. Circuit denied states' and industry groups' motions to stay EPA's rule aimed at reducing pollution from fossil fuel power plants. Petitioners argued…

The U.S. Supreme Court, 5-4, granted three states' and several industry groups' applications to stay enforcement of EPA's 2023 rule issuing a federal implementation plan (FIP) for…

The D.C. Circuit rejected challenges to renewable fuels standards EPA set for 2020, 2021, and 2022. Cellulosic biofuel producers argued the standards were set too low, and petroleum refiners…

The Third Circuit denied power companies' petition to review EPA's issuance of a federal implementation plan (FIP) establishing nitrogen oxide (NOx) emission limits for selective…

The Fifth Circuit rejected an environmental group's challenge to the Louisiana Department of Environmental Quality's (LDEQ's) decision to issue preconstruction permits for a…

The D.C. Circuit upheld EPA's 2022 decision to reinstate a prior waiver of federal preemption of two California regulations concerning automobile emissions under the CAA. States and fossil…

The D.C. Circuit, 2-1, granted in part and denied in part petitions to review EPA's SIP call for 35 states and the District of Columbia. A group of about half these states as well as…