In an unpublished order, the Fifth Circuit, 2-1, stayed EPA's disapproval of SIPs submitted by Texas and Louisiana following the Agency's 2015 revision to the ozone NAAQS.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

A district court denied environmental groups' motion for partial summary judgment in a CAA citizen suit brought against a steel company concerning hydrogen sulfide and sulfur dioxide…

The First Circuit affirmed the Massachusetts Department of Environmental Protection's (MDEP's) decision to issue an air permit for a natural gas compressor station in Weymouth,…

The D.C. Circuit denied a challenge to EPA's 2015 rule updating the standards under which the Agency audits wood-burning heaters' compliance with CAA emissions limits. An industry group…