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 vacated and remanded the FAA's "no hazard" determinations for a proposed offshore wind farm in Nantucket Sound. A town and a citizens group filed suit arguing that the FAA violated its governing statute, misread its own regulations, and arbitrarily and capriciously failed to calcula...

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...