The U.S. Supreme Court held that EPA's regulation of greenhouse gas (GHG) emissions from new motor vehicles did not automatically trigger the CAA's permitting requirements for stationary…

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…

A district court dismissed an environmental group's citizen suit in which it alleged a power company was attempting to construct a major modification of its coal-fired power plant in Illinois…

The D.C. Circuit vacated an EPA memorandum directing regional air districts to apply different criteria when making source determinations in its Title V or new source review (NSR) permitting…

The D.C. Circuit upheld EPA’s decision to defer adopting new secondary NAAQS for oxides of sulfur (SOx) and nitrogen (NOx) pending further scientific study. Citing doubts about the accuracy of its…

A district court dismissed an individual's CAA lawsuit against a Colorado utility and the state's environmental agency in which he alleged that toxic fumes were emitted into his…

The D.C. Circuit upheld EPA’s decision denying environmental groups’ request to add coal mines to the regulated list of stationary source categories under the CAA. In denying the groups’…

The D.C. Circuit denied industry groups' petition for review challenging EPA's 2013 primary NAAQS for fine particulate matter. In the final rule, EPA lowered the level of the particulate…

The D.C. Circuit upheld EPA's renewable fuels standard (RFS) for 2013. Because EPA reduced the cellulosic ethanol blending requirement for 2013 but not the total renewable fuel volume,…

The U.S. Supreme Court reversed and remanded a lower court decision vacating EPA's transport rule, also known as the Cross-State Air Pollution Rule, which sets sulfur dioxide and nitrogen…