The EPA finalized a rule to curb nitrogen oxide emissions from power plants in 12 states, ahead of a July deadline for states to be in compliance with the 2008 ozone standard. The rule follows a string of prior regulations and litigations regarding interstate pollution, which the Clean Air Act requires upwind states to address because their pollution causes air quality problems in other states. The rule will require power plants in the 12 states to optimize their use of already-installed pollution controls for 2021.
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