News & Analysis as of

Air Pollution Regulatory Requirements Air Quality Standards

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

Air Enforcement: Arkansas Department of Energy and Environment - Division of Environmental Quality and Searcy Compression Station...

The Arkansas Department of Energy and Environment - Division of Environmental Quality (“DEQ”) and Merit Energy Company, LLC (“Merit”) entered into a May 15th Consent Administrative Order (“CAO”) addressing an alleged...more

Williams Mullen

Exceptional Events Part of North Carolina Particulate Air Quality Attainment Designation

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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

Williams Mullen

Environmental Notes - April 2025

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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

Troutman Pepper Locke

Texas BACT Is a Fact: The Texas Supreme Court Unpacks the Texas Clean Air Act’s BACT Definition

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Port Arthur Community Action Network (PACAN) v. Texas Commission on Environmental Quality et al. (Tex. Feb. 14, 2025) presented the Texas Supreme Court with a unique opportunity to provide defined guideposts to understand...more

Foley Hoag LLP - Environmental Law

The D.C. Circuit Affirms EPA’s Reinstatement of California’s Authority to Set Auto Emissions Limits; Don’t Get Too Excited About...

On Tuesday, in Ohio v. EPA, the D.C. Circuit Court of Appeals denied several challenges to EPA’s decision to restore California’s authority under § 209(b) of the Clean Air Act to regulate emissions from motor vehicles. It’s...more

Jenner & Block

EPA Lowers the PM2.5 NAAQS

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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

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