The Fifth Circuit upheld EPA's decision to disapprove certain revisions to Texas' SIP. EPA disapproved the revisions concerning the state's "qualified facilities program…

The Ninth Circuit held that EPA's approval of the 2004 SIP for the San Joaquin Valley nonattainment area for the one-hour ozone NAAQS was arbitrary and capricious. Although it approved the…

The Ninth Circuit upheld EPA's determination that a California SIP that imposes limits on motor vehicle emissions for years 2009 and 2012 are adequate for purposes of the state's…

The Fifth Circuit granted EPA's request to transfer to the D.C. Circuit Texas' petition for review of the Agency's call for revisions to the state's SIP because its…

The Ninth Circuit granted citizen groups' petition for review of a final action by EPA approving in part and disapproving in part revisions to California's SIP for meeting CAA air…

The court vacates the U.S. Environmental Protection Agency's (EPA's) approval of the revised ozone state implementation plans (SIPs) for the Washington, D.C., Metropolitan Area (…

The court vacates the Environmental Protection Agency's (EPA's) approval of a county's Clean Air Act (CAA) new source review (NSR) program because EPA did not adequately assess…

The court remands three portions of technical amendments the U.S. Environmental Protection Agency (EPA) made to its nitrogen oxide (NOx) state implementation plan (SIP) call rulemaking that…

The court denies a petition to review the U.S. Environmental Protection Agency's (EPA's) approval of a revision to Missouri's Clean Air Act (CAA) state implementation plan that…

The court affirms the U.S. Environmental Protection Agency's (EPA's) disapproval of a revision to the Michigan Clean Air Act (CAA) state implementation plan (SIP) that automatically…