The D.C. Circuit vacated DOE's 2020 rule establishing more stringent energy efficiency standards for commercial packaged boilers, and its 2022 supplemental document responding to the court's previous remand order that it address comments raised during the rulemaking process. Industry groups argued D...

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 with those recently promulgated by the International Civil Aviation Organization (ICAO). Twelve states, the Di...

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 that had attained 2015 ozone pollution standards. The revised designations folded Weld County into the greater ...