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…

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…

The Third Circuit affirmed a lower court decision dismissing the U.S. government's lawsuit against the current and former owners of a coal-fired power plant in Indiana County, Pennsylvania,…

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…

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…

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…

The D.C. Circuit denied states' and industry groups' petitions challenging EPA rules establishing CAA permitting requirements in states that do not have implementation plans for…

The D.C. Circuit remanded for reconsideration EPA's revisions to the secondary, welfare-based NAAQS for ozone, but denied petitions challenging revisions to the primary, health-based ozone…

The Tenth Circuit affirmed an EPA order denying an environmental group's petition to object to a CAA Title V operating permit for a coal-fired power station in Colorado. In its petition for…