The D.C. Circuit denied petitions to review EPA's promulgation of a rule that regulates the emission of greenhouse gases from aircraft engines under CAA §231 by aligning domestic standards…

The D.C. Circuit granted in part and denied in part petitions to review EPA's revisions to designations promulgated in 2018 for northern Weld County, Colorado, and El Paso, Texas, as areas…

The D.C. Circuit, in a split ruling, vacated certain provisions of EPA's rule phasing out the use of hydrofluorocarbons (HFCs). Two companies and three trade groups argued EPA exceeded its…

In an unpublished order, the Fifth Circuit, 2-1, stayed EPA's disapproval of SIPs submitted by Texas and Louisiana following the Agency's 2015 revision to the ozone NAAQS. The states…

The D.C Circuit denied an industry group's challenge to EPA's 2021 rule requiring power plants in several upwind states to reduce nitrogen oxide emissions. The group argued the rule was…

The Sixth Circuit granted a petition to review EPA's removal of an air nuisance rule from Ohio's SIP. Environmental groups and individuals argued that EPA violated the CAA and APA in…

The Fifth Circuit granted small refiners' motion to stay certain compliance obligations under the CAA pending appeal of EPA's decision denying their requested hardship exemptions from…

The D.C. Circuit dismissed an oil company's petition to review EPA's response concerning the decommissioning status of two oil platforms off the California coast. The company initially…

The D.C. Circuit dismissed for lack of standing a petition to review a 2016 EPA rule concerning greenhouse gas emissions and fuel efficiency standards for medium- and heavy-duty engines and…

The U.S. Supreme Court held, 6-3, that President Barack Obama's EPA had exceeded its statutory authority under §111(d) of the CAA when it promulgated the Clean Power Plan to address carbon…