News & Analysis as of

Environmental Policies National Ambient Air Quality Standards Regulatory Requirements

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

PM 2.5/Clean Air Act: Environmental Organizations Joint Letter to U.S. EPA Opposing Revisiting NAAQS

One hundred environmental organizations transmitted an April 21st letter to the United States Environmental Protection Agency (“EPA”) Administrator asking that the federal agency: …maintain and promptly implement a vital,...more

Snell & Wilmer

EPA Steps Back, Arizona Moves Forward

Snell & Wilmer on

In a significant development for Arizona’s business community and environmental policymakers, the U.S. Environmental Protection Agency (EPA) has paused its planned reclassification of Maricopa County from “Moderate” to...more

Williams Mullen

Exceptional Events Part of North Carolina Particulate Air Quality Attainment Designation

Williams Mullen on

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

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

Foley Hoag LLP - Environmental Law

Good Neighbors Delayed Are Good Neighbors Denied

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

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