A district court held that Washington state must establish reasonably available control technology (RACT) for greenhouse gas emissions. Based on its plain language, the RACT provision contained in Washington's federally approved SIP is not discretionary and requires the state's agencies to estab...

The D.C. Circuit remanded EPA's NESHAPs for portland cement facilities. While EPA was establishing the NESHAPs, it was simultaneously developing a definition of commercial and industrial solid waste incinerators (CISWI), which would create a separate category of pollutant sources subject to emis...

A California appellate court affirmed a lower court decision denying a natural gas company's petition challenging an air district rule requiring the company to monitor, record, and report changes in the quality of natural gas and air pollutant levels. The district acted reasonably in finding that ga...

The D.C. Circuit upheld an EPA rule issued in 2010 that amends and clarifies transportation conformity regulations as they pertain to hot spot analyses in particulate matter (PM) nonattainment and maintenance areas. Transportation conformity is required under the CAA to ensure that new federally sup...

The court holds that the U.S. Environmental Protection Agency's (EPA's) construction of the Clean Air Act (CAA) in promulgating the revised national ambient air quality standards (NAAQS) for ozone and particulate matter (PM) effects an unconstitutional delegation of legislative power and remands the...

The court holds that the U.S. Department of Transportation's (DOT's) approval of a 12-lane bridge to replace an existing 6-lane bridge in Alexandria, Virginia, violated the Clean Air Act (CAA), the National Environmental Policy Act (NEPA), the National Historic Preservation Act (NHPA), and the Depar...

The court holds that the U.S. Environmental Protection Agency's (EPA's) Acid Deposition Standard Feasibility Study Report to Congress complied with the Clean Air Act's (CAA's) mandate that it include a description of the nature and numerical value of deposition standards that would be sufficient to ...

The court holds that an automobile manufacturers association is entitled to attorney fees in connection with an underlying action in which New York's zero emission vehicle sales requirement for model years 1998-2002 was held preempted under Clean Air Act (CAA) §209. The court first holds that the a...

The court holds that it has subject matter jurisdiction over an environmental group's Clean Air Act (CAA) citizen suit that alleged emission and reporting violations at a refinery. The court first holds that under CAA §304, the group provided the refinery with adequate notice of the violation befor...

The court denies in part and grants in part the U.S. Environmental Protection Agency's (EPA's) petition for rehearing of a decision holding that EPA's revised national ambient air quality standards (NAAQS) for ozone were not based on intelligible principles in the Clean Air Act (CAA) for setting suc...