News & Analysis as of

Clean Air Act Air Quality Standards Regulatory Requirements

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

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,...

Regional Haze/Arkansas: U.S. Environmental Protection Agency Announces Approval of Five-Year Progress Report

The United States Environmental Protection Agency (“EPA”) published a final rule in the October 1st Federal Register approving the State of Arkansas’s Regional Haze Five-Year Progress Report. See 84 Fed. Reg. 51986. EPA...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

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

Modified Minor Sources/Arkansas State Implementation Plan: U.S. Environmental Protection Agency Region 6 Announces Approval

The United States Environmental Protection Agency (“EPA”) Region 6 Office announced in a June 29th news release that it approved certain revisions to a State of Arkansas State Implementation Plan (“SIP”). The approved...more

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