The Environmental Protection Agency in an unexpected move Wednesday night canceled its one-year delay of the Obama administration’s strict rules for smog-forming ozone emissions, prompting Democratic state attorneys general to claim victory after suing the agency the night before.

“Just 1 day ago, I led a coalition of 16 AGs in suing @EPA for failing to protect kids from smog. Tonight, the Trump @EPA reversed course,” tweeted New York Democratic Attorney General Eric Schneiderman. EPA must enforce the regulations beginning Oct. 1.

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