First issued in 2011 but quickly met with numerous legal challenges, the EPA's Cross State Air Pollution Rule is finally cleared for takeoff.
Last week, the U.S. Court of Appeals for the D.C. Circuit lifted a hold it had placed on the CSAPR, effectively giving the EPA a green light to begin implementing the rule, which regulates air pollution from power plants in 28 states that drifts across state lines, contributing to ozone and fine particle pollution.
The CSAPR creates a two-step process: first the EPA determines whether or not a state contributes more than 1% of the pollution causing a neighbor to exceed federal air standards, then the EPA gives the polluter state an emissions budget based on a complex modeling system.
It's been a long road for the EPA to get to this point. Courts struck down the agency's first two attempts to draft a rule for regulating sulfur and nitrogen emissions from power plants that drift from one state to another. After the EPA announced the final CSAPR in July of 2011, the D.C. Circuit Court of Appeals placed a hold on the rule the following December before throwing it out altogether last year in response to a lawsuit filed by 15 power utilities and upwind states.
But in April of this year, the Supreme Court ruled 6-2 in favor of the EPA, upholding the CSAPR. In the majority opinion, Justice Ruth Bader Ginsburg wrote that the CSAPR “is a permissible, workable, and equitable interpretation of the Good Neighbor provision” of the Clean Air Act, which grants the EPA the authority to regulate intersate pollution that threatens national air quality standards.
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