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
Twenty-four State Attorneys General filed a Petition for Review (“Petition for Review”) in the United States Court of Appeals for the District of Columbia Circuit challenging a United States Environmental Protection Agency...more
On February 7, 2024, the U.S. Environmental Protection Agency (EPA) released its Final Rule lowering the primary annual National Ambient Air Quality Standard (NAAQS) for fine particulate matter (PM 2.5) from the current level...more
EPA’s Big Plans for 2023: Top Air Rulemakings We Are Watching - An environmental lawyer walks into a cocktail party. An often-asked question is: What is happening at EPA in your world? What should we be watching that...more
The United States Environmental Protection Agency (“EPA”) issued a final rule retaining the current National Ambient Air Quality Standard (“NAAQS”). This leaves in place the ozone NAAQS that was promulgated during the...more
On May 30, 2019, the U.S. Environmental Protection Agency (EPA) issued a final memorandum on fine particulate matter (PM2.5) precursor demonstration guidance. Memorandum from Scott Mathias, Acting Director, EPA Air Quality...more
The United States Environmental Protection Agency (“EPA”) published an August 8th Federal Register notice containing a direct final rule that approves revisions to the Arkansas State Implementation Plan (“SIP”). See 83 Fed....more
The status of a controversial rule establishing more stringent ambient air quality standards for ozone—promulgated by former President Barack Obama’s Environmental Protection Agency (EPA)—remains unclear following a series of...more
On October 1, the Environmental Protection Agency issued a prepublication version of a final rule establishing a new National Ambient Air Quality Standard (NAAQS) for ozone. The final rule lowers the primary and secondary...more
On October 1, 2015, EPA finally released its final rule revising the ozone NAAQS to 70 ppb. I do not spend much time peering into a crystal ball, but I will go out on a limb and say that the industry challenges to the rule...more