The D.C. Circuit granted in part and denied in part Delaware's and Maryland's challenges to EPA's denial of their CAA §126(b) petitions requesting that the Agency impose additional limitations on…

The D.C. Circuit denied downwind states' petition challenging EPA's refusal to expand the Northeast Ozone Transport Region, which consists of states required by the Agency to enact tight…

A district court ordered EPA to issue federal implementation plans fully resolving interstate transport obligations under the CAA's "good neighbor" provision for the 2008 ozone NAAQS. EPA conceded…

The D.C. Circuit, on remand from the U.S. Supreme Court, invalidated EPA's 2014…

The D.C. Circuit held that environmental groups lacked standing to challenge an EPA memo issued to regional directors in response to an earlier court decision vacating the Agency's 2011 Cross-…

The U.S. Supreme Court reversed and remanded a lower court decision vacating EPA's…

The Third Circuit upheld an EPA rule imposing sulfur dioxide (S02) limits on a coal-fired power plant in Pennsylvania whose emissions travel directly across a river into areas of New Jersey. The…