A district court denied industry groups' motion to intervene in a CAA citizen suit concerning EPA's alleged failure to review the ozone NAAQS in a timely manner. The underlying lawsuit concerns…

The Supreme Court of Kansas reversed and remanded the Kansas Department of Health and Environment's decision to issue a prevention of significant deterioration (PSD) permit to a power company to…

The Eighth Circuit vacated and remanded EPA's best available retrofit technology (BART) determination for a large power plant in North Dakota, but otherwise upheld EPA's partial disapproval of two…

The Eleventh Circuit reversed a lower court decision excluding the testimony of two expert witnesses in the government's case against a power company for making major modifications at three of its…

The Fifth Circuit held that it lacked jurisdiction to review petitions challenging EPA's objection to three CAA Title V permits issued by the Louisiana Department of Environmental Quality for a…

The Third Circuit affirmed a lower court decision dismissing the U.S.…

The D.C. Circuit remanded EPA's "maximum achievable control technology" (MACT) standards for sewage sludge incinerators under CAA §129. The court upheld EPA's authority to regulate sewage sludge…

The Third Circuit held that the CAA does not preempt state law tort claims brought by private property owners against a source of pollution located within the state. The case arose after a group…

The Ninth Circuit upheld the dismissal of an environmental group's challenge to a CAA permit that allows an oil company to conduct "pollutant emitting activities" associated with a drilling vessel…

The D.C. Circuit denied petitions challenging EPA's revised NESHAPs for primary lead processing operations. Despite petitioners' argument to the contrary, EPA's use of the lead NAAQS as a…