By Edvard Pettersson – Feb 21, 2012 8:34 PM GMT
Royal Dutch Shell Plc (RDSA)s air pollution permits for offshore oil drilling in Alaska were challenged by environmental groups who said the permits violate the U.S. Clean Air Act.
The Alaska Wilderness League and eight other organizations filed a petition with the U.S. Court of Appeals in San Francisco on Feb. 17, asking it to review two permits the U.S. Environmental Protection Agency granted Shell to operate its Discoverer drillship in the Sea of Beaufort and the Sea of Chukchi.