National Ambient Air Quality Standards (NAAQS)

Recent Activity

Results are sorted by the date of most recent activity.

State of California v. EPA

February 18, 2021

U.S. Chamber and industry associations move to intervene to help defend the 2020 review of the National Ambient Air Quality Standards for Particulate Matter.

State of New York v. EPA

February 18, 2021

U.S. Chamber and industry associations move to intervene to help defend the 2020 review of the National Ambient Air Quality Standards for Ozone.

Sierra Club v. EPA; Downwinders at Risk v. EPA

January 29, 2021

D.C. Circuit vacates the interprecurser trading program. The U.S. Chamber filed a coalition amicus brief opposing this outcome.

Sierra Club v. EPA; Downwinders at Risk v. EPA

November 8, 2019

U.S. Chamber files coalition amicus brief urging D.C. Circuit to reject NGO’s challenge to rules permitting the banking and trading of precursor chemicals to ozone formation, a long recognized...