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...

The D.C. Circuit dismissed teenagers' lawsuit against the federal government for failing to cap greenhouse gas emissions. Invoking the federal question statute, 28 U.S.C. §1331, as the basis for subject matter jurisdiction, the minors alleged that the federal defendants are trustees of essential na...

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 ...