U.S. Court of Appeals for the D.C. Circuit

Case Status


Docket Number

Oral Argument Date

October 07, 2019


Case Updates

D.C. Circuit holds that EPA memorandum on significant impact levels (SILs) for ozone is not final agency action subject to review under the Clean Air Act and dismisses environmental NGOs’ challenges to EPA’s memorandum

April 07, 2020

Click here to view the opinion.

U.S. Chamber files coalition brief as intervenor in support of EPA’s guidance establishing significant impact limits for the NAAQS program

April 15, 2019

Click here to view the Chamber’s coalition brief. The Chamber’s brief argues that the EPA’s guidance is not contrary to the Clean Air Act and is neither arbitrary nor capricious.

U.S. Chamber and business groups move to intervene to defend EPA guidance document clarifying and improving process for analyzing emissions during PSD permitting

July 18, 2018

Click here to view the motion for leave to intervene, which was granted.

Makram B. Jaber, Lucinda Minton Langworthy, Felicia H. Barnes, Shannon S. Broome, and Charles H. Knauss of Hunton Andrews Kurth LLP served as co-counsel for the U.S. Chamber of Commerce on behalf of the U.S. Chamber Litigation Center.

Case Documents