The D.C. Circuit vacated an EPA guidance document addressing obligations of regions still in nonattainment of the 1997 one-hour ozone NAAQS. The guidance binds EPA regional directors and thus…

The D.C. Circuit upheld the dismissal of a CAA citizen suit challenging EPA's failure to take action to prevent the construction of three proposed pollution-emitting facilities in Kentucky…

The Ninth Circuit upheld the dismissal of an environmental group's CAA claim challenging an air quality district's method for offsetting emissions increases in its new source review…

The D.C. Circuit denied medical waste trade associations' petition for review challenging EPA's performance standards for new and existing hospital/medical/infectious waste…

The Seventh Circuit denied environmental groups' petitions challenging EPA's approval of revisions to Wisconsin's new source review program. In 2002, EPA changed the rules that…

The Tenth Circuit upheld the dismissal of an environmental group's CAA citizen suit against a power company alleging that it was attempting to build a coal-fired power plant with an…

The Ninth Circuit held that the CAA does not preempt a local air district's adoption and enforcement of rules regulating air emissions from diesel-powered engines. CAA §209(e) expressly…

The Ninth Circuit reversed a lower court decision denying the award of attorney fees to an environmental group in their lawsuit against a town for discharging toxic pollutants into a bay in…

The D.C. Circuit denied a petition for review challenging EPA's decision granting California a waiver from federal preemption under the CAA that allows the state to implement its own…

The Fourth Circuit upheld a lower court's fee award in favor of environmental groups in their CAA case against an energy company. Below, the groups moved for summary judgment on the basis…