The Environmental Protection Agency has issued Royal Dutch Shell PLC notices of air quality violations for emissions involving its Arctic drilling operation in 2012.
The EPA late Thursday issued the notices saying that Shell violated permits for nitrous oxides emissions coming from its drill rig and drill ship. The federal agency says Shell had multiple permit violations for each ship.
The two ships are the drill rig Kulluk, which recently grounded near Kodiak Island when it was being towed to Seattle for maintenance and broke free in a storm. The damaged drill rig has been refloated and taken to a sheltered harbor. The drill ship Noble Discoverer remains in Seward after the Coast Guard found safety problems.
Shell is trying to revise its air permit to operate in the Arctic.