A district court denied EPA's request to stay a previous order requiring it to comply with its 2016 Emission Guidelines and Compliance Times for Municipal Solid Waste Landfills. Eight states…

The Fifth Circuit upheld EPA's approval of Louisiana's SIP for controlling regional haze. Environmental groups challenged the approval of Louisiana's selection of low-sulfur coal…

The D.C. Circuit vacated EPA's 2018 update to the Cross-State Air Pollution Rule (CSAPR). States and environmental groups argued that EPA violated the CAA by failing to require upwind states…

The D.C. Circuit granted in part and denied in part a petition challenging EPA's update to the Cross-State Air Pollution Rule. Environmental groups and Delaware argued that EPA violated the…

The Ninth Circuit denied an environmental group's petition to review EPA's approval of a Montana SIP revision. The group argued that the approval was arbitrary and capricious because…

A district court ordered EPA to issue federal implementation plans fully resolving interstate transport obligations under the CAA's "good neighbor" provision for the 2008 ozone…

The Fifth Circuit stayed EPA's regional haze plan for Oklahoma and Texas until the underlying petitions for review challenging the rule are resolved. Texas, energy companies, power plants,…

A district court ordered EPA to impose a "good neighbor” federal implementation plan (FIP) for Texas with respect to the 1997 fine particulate matter (PM2.5) NAAQS. In 2015, the D.C. Circuit…

A district court dismissed on summary judgment environmental groups' lawsuit against a mining company for alleged SIP violations as it relates to NAAQS for coarse particular matter (PM10).…

The Ninth Circuit held that EPA did not act arbitrarily and capriciously when it disapproved in part Arizona's regional haze SIP and issued a replacement federal implementation plan (FIP) in…