News & Analysis as of

Air Quality Standards Clean Air Act Environmental Litigation

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

Air/Wastewater Enforcement/Citizen Suit Action: Conservation Law Foundation and Quincy, Massachusetts Bio-based Chemical...

The Conservation Law Foundation (“CLF”) and Twin Rivers Technologies (“TRT”) entered into a March 30th Consent Decree (“CD”) addressing alleged violations of the Clean Air Act and the Clean Water Act. See No....more

Allen Matkins

California Environmental Law & Policy Update 5.2.25

Allen Matkins on

The White House Council on Environmental Quality (CEQ) circulated a draft template, dated April 8, 2025, to assist federal agencies in updating their procedures for implementing the National Environmental Policy Act (NEPA)....more

Goldberg Segalla

Frustrated by EPA’s Delay on Air Quality, Environmental Groups Tell the Agency: “NOx it Off!”

Goldberg Segalla on

Nitrogen Oxide (NOx) is a very reactive, brown-hued gas commonly produced when fuels are burned at high temperature by motor vehicles, chemical plants, etc. Industries will often intentionally oxidize NOx to produce lacquers,...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

Foley Hoag LLP - Environmental Law

EPA Lowers the PM2.5 NAAQS: Goldilocks Can Sleep Soundly

On February 7, 2024, EPA finalized a rule lowering the primary annual National Ambient Air Quality Standard for PM2.5 to 9.00 ug/m3.  This is a significant reduction from the current 12.00 ug/m3 standard and a victory for...more

Foley Hoag LLP - Environmental Law

EPA Finalizes Decision to Retain the Existing PM2.5 NAAQS — Single Worst Environmental Decision of the Trump Administration?

Yesterday, EPA finalized its decision to retain the existing PM2.5 NAAQS of 12 ug/m3, rejecting substantial scientific evidence that PM2.5 causes significant harm at concentrations below 12 ug/m3. In fact, as noted in one of...more

Foley Hoag LLP - Environmental Law

The Other Shoe Drops on Upwind Ozone States

On Tuesday, the District of Columbia Court of Appeals vacated EPA’s “Close-Out Rule,” which basically concluded that upwind states contributing to exceedances of the National Ambient Air Quality Standard for ozone in downwind...more

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