The U.S. Supreme Court held that EPA's regulation of greenhouse gas (GHG) emissions from new motor vehicles did not automatically trigger the CAA's permitting requirements for stationary sources that emit GHGs. The Court, therefore, vacated portions of the Agency's "tailoring" rule mandating PSD per...

A district court held that an environmental group lacked standing to challenge a U.S. Army Corps of Engineers permit issued to an oil company to fill certain wetlands in the National Petroleum Reserve–Alaska for a future drill site. The group's members have not demonstrated the requisite injury in...

A district court dismissed an environmental group's citizen suit in which it alleged a power company was attempting to construct a major modification of its coal-fired power plant in Illinois without a PSD permit in violation of the CAA. The project will physically replace an existing boiler with a ...

The D.C. Circuit vacated an EPA memorandum directing regional air districts to apply different criteria when making source determinations in its Title V or new source review (NSR) permitting decisions for facilities located in areas within the jurisdiction of the U.S. Court of Appeals for the Sixth ...