A district court dismissed an automobile engine manufacturer's lawsuit against EPA seeking to force the Agency to recall model year 2010 heavy-duty diesel engines equipped with liquid, urea-based selective catalyst reduction (SCR) technology for failing to comply with CAA emissions standards. Th...

The Ninth Circuit denied a chemical company's petitions for review challenging EPA's partial disapproval of a proposed revision to Montana's SIP governing sulfur dioxide (SO2) emissions, its 1993 "SIP Call" that started the review process, and the Agency's 2008 federal implementation plan (FIP) reme...

A district court vacated EPA's stay of two rules setting forth emission standards from boilers and commercial and industrial solid waste incineration units. EPA issued the rules on March 21, 2011, and shortly thereafter several parties filed petitions for review challenging the legal sufficiency of ...

A California appellate court affirmed a lower court decision dismissing a petition challenging an air district's abatement order directing the owners of an open-pit mining operation to cease operation of the central plant equipment and all internal combustion engines with a rating greater than 5...

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...