The US Environmental Protection Agency has revoked two air quality permits it issued to Shell for drilling projects planned in the Beaufort and Chukchi seas off the coast of Alaska.

摘要

The EPA said it issued the permits in 2010, allowing the company to operate a drilling ship and support vessels in the target areas. An appeal by greens and indigenous peoples in the area claimed the EPA applied outdated nitrogen dioxide standards to the permits. That claim was upheld by the EPA Environmental Appeals Board.