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State implementation plans (SIPs)

New Jersey v. Wheeler

A district court granted states' motion for summary judgment in a lawsuit concerning EPA's duty to limit air pollution drifting from upwind states into northeastern states. Connecticut, Delaware, Massachusetts, New Jersey, and New York...

California v. United States Environmental Protection Agency

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 had argued that the Agency failed to...

Sierra Club v. United States Environmental Protection Agency

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 over a more effective pollutant control as the best...

New York v. Environmental Protection Agency

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 to reduce their contribution of ozone...

Wisconsin v. Environmental Protection Agency

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 CAA by failing to require upwind states to...

Montana Environmental Information Center v. Thomas

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 Montana's Department of Environmental Quality...

New York v. Pruitt

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 NAAQS. EPA conceded that it missed the deadline to do so...

Texas v. United States Environmental Protection Agency

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, and others challenged EPA's action disapproving...

Sierra Club v. United States Environmental Protection Agency

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...

Utah Physicians for a Healthy Environment v. Kennecott Utah Copper LLC

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). Under the Utah SIP's "material moved" provision...

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