The Second Circuit vacated a district court's dismissal of a lawsuit concerning a product that disables motor vehicle emissions controls. The federal government sued the company that…

The Tenth Circuit granted in part and denied in part a challenge to EPA's approval of Colorado's 2019 SIP revisions. An environmental group argued the revisions, which changed the…

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…

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 groups…

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…

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 two…

The Fifth Circuit agreed to rehear a petition for review that it previously denied concerning EPA's designation of two counties in Texas as nonattainment for the 2010 sulfur dioxide NAAQS.…

The Tenth Circuit granted in part and denied in part an environmental group's petition to review EPA approval of Colorado's 2019 SIP revisions. The group argued the revision to…

The Fifth Circuit granted in part and denied in part states' challenges to EPA's disapprovals of SIPs developed in response to the Agency's 2015 decision calling for SIPs to achieve…

The Tenth Circuit denied environmental groups' petition to review an EPA rule that partially approved Colorado's SIP to reduce ozone pollution. The groups sought vacatur of the approval…