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Five oil refineries in Washington state are under pressure to clean up their airborne emissions as a result of a district court decision late last week.

The state and regional clean air agencies have been violating the Clean Air Act by not requiring the refineries to reduce pollution using what is termed “reasonably available technology,” said the Washington Environmental Council and the Sierra Club.

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Attorney Janette Brimmer with Earthjustice argued the case for the plaintiffs and summarizes the main question.

“What was the state’s obligation, or the regional clean air agencies, to set basic minimum standards for this kind of pollution — like methane and nitrous oxide and carbon dioxide — from refineries? And the state was saying, ‘We don’t think we have to do this, at least not under our federally-enforceable plan.’ And we said, ‘Well, we think you do have to do it.’ ”

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The state and regional clean air agencies said they’ve been waiting for more guidance from the U.S. Environmental Protection Agency (EPA), but U.S. District Court Judge Marsha Pechman said the agencies have a responsibility to enforce the state clean air plan that’s already in place, ruling in favor of the plaintiffs.

One issue raised in court is Washington’s State Implementation Plan for regulating air pollution is tougher in some ways than federal greenhouse gas standards, and the agencies weren’t sure they could enforce it. However, the judge pointed out the EPA has “repeatedly approved” the state plan.

“The reality is that, despite a lot of good policy statements about greenhouse gases and climate change in Washington, we really have not regulated greenhouse gas pollution very much, particularly from existing sources like these big refineries,” Brimmer said.

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