The Environmental Protection Agency said Tuesday that it is hammering out details with states on implementing the Obama administration’s 2015 rule for ozone pollution, as environmental groups railed against EPA Administrator Scott Pruitt for missing Monday night’s legally enforceable deadline for meeting the regulations.

The agency is “continuing to work closely with the states to work through the designations process for the 2015 ozone standard,” said EPA spokeswoman Liz Bowman in an email to the Washington Examiner.