News & Analysis as of

Air Quality Standards National Ambient Air Quality Standards Final Rules

Jenner & Block

EPA Lowers the PM2.5 NAAQS

Jenner & Block on

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

Mitchell, Williams, Selig, Gates & Woodyard,...

Particulate Matter/Revised National Ambient Air Quality Standard: 24 State Attorneys General (including Arkansas) Challenge U.S....

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

Robinson+Cole Environmental Law +

EPA Lowers the Fine Particulate NAAQS: A Closer Look at Implementation and Potential Impacts

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

Williams Mullen

Environmental Notes - April 2023

Williams Mullen on

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

Mitchell, Williams, Selig, Gates & Woodyard,...

Ozone/Clean Air Act: U.S. Environmental Protection Agency Final Rule Retaining Current National Ambient Air Quality Standard

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

Katten Muchin Rosenman LLP

EPA Issues Final Guidance for States for Consideration of PM2.5 Precursors

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

Mitchell, Williams, Selig, Gates & Woodyard,...

Arkansas State Implementation Plan Revisions Approval: August 8th U.S. Environmental Protection Agency Federal Register Notice...

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

Snell & Wilmer

Seven Months into the Trump Administration, Outlook of Controversial Obama-Era Ozone Standard Remains Hazy

Snell & Wilmer on

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

BakerHostetler

EPA Releases Revised Ozone NAAQS

BakerHostetler on

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

Foley Hoag LLP - Environmental Law

EPA Lowers the Ozone Standard to 70 PPB: Industry Isn’t Happy, But It Should Be

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

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