The D.C. Circuit denied two petitions to review EPA attainment designations for the 2010 sulfur dioxide NAAQS. An environmental group argued that the Agency should have designated Gallia County,…

The D.C. Circuit upheld EPA's designation of Yellowstone County, Montana, and Wayne County, Michigan, as "nonattainment" under the sulfur dioxide (SO2) NAAQS. Two petitioners—an…

The Seventh Circuit denied a petition for review challenging EPA’s decisions to redesignate three geographic areas—Milwaukee-Racine, Greater Chicago, and the Illinois portion of the St. Louis area…

The D.C. Circuit upheld EPA's rule designating certain areas in Utah as nonattainment for the 2006 24-hour fine particulate matter (PM2.5) standard. Petitioners—two counties, three cities,…

The Sixth Circuit upheld EPA's redesignation of Cleveland, Ohio, from nonattainment to attainment for particulate matter under CAA §107(d)(3)(E). An environmental group argued that…

The court affirms the U.S. Environmental Protection Agency's (EPA's) decision to redesignate the Cleveland-Akron-Lorain, Ohio, area as a Clean Air Act (CAA) attainment area for ozone.…

The Third Circuit denies an organization of manufacturers' and local governments' petition for review of the U.S. Environmental Protection Agency's (EPA's) denial of…