PSD › Clean Air Act

EPA Permitting Regulations Vacated—Project Delays Expected

The recent decision in Sierra Club v. EPA, 705 F.3d 458 (D.C. Cir. 2013) vacated all of EPA’s rules on Significant Monitoring Concentrations (“SMCs”), as well as some (the Prevention of Significant Deterioration (“PSD”)...more

EPA Loses Another PSD Case: The Clean Air Act is “Extraordinarily Rigid”

In Sierra Club v. EPA, issued today, The Court of Appeals for the District of Columbia rejected EPA’s rules governing “significant impact levels” and “significant monitoring concentrations” for determining PSD permitting...more