Effective May 2024, EPA tightened the annual health-based National Ambient Air Quality Standard (NAAQS) for fine particulate matter (PM2.5) from 12.0 µg/m3 to 9.0 µg/m3. This change was made after a review of the available...more
Under the Clean Air Act, sources frequently must undergo “New Source Review” (NSR) permitting, which is a pre-construction permitting program. NSR establishes requirements for new or modified sources prior to initiating...more
On March 6, 2024, EPA published its final rule lowering the primary annual National Ambient Air Quality Standards (“NAAQS”) for fine particulate matter (“PM2.5”) to 9.0 micrograms per cubic meter (“µg/m3”). The new, more...more
Last Friday, the D.C. Circuit Court of Appeals ruled that EPA violated the Clean Air Act in failing to impose deadlines on upwind states violating the CAA’s Good Neighbor provisions. The Court concluded that, where downwind...more