The three-judge panel ordered EPA “to file status reports on the agency’s review of the 2015 Rule at 90-day intervals beginning 90 days from the date of this order,” adding that within “30 days of the agency notifying the court and the parties what action it has or will be taking with respect to the 2015 Rule, the parties are directed to file motions to govern future proceedings in these consolidated cases.”

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How Trump is rolling back Obama’s legacy View Graphic How Trump is rolling back Obama’s legacy

EPA has not yet said exactly what it plans to do about the ozone National Ambient Air Quality Standards (NAAQS), which the agency lowered from 75 parts per billion to 70 parts per billion. Ozone, generated by the burning of fossil fuels by cars, trucks and factories, produces hazy skies and is linked to lung and heart disease.

Scott Pruitt joined attorneys general from nine other states in challenging the rule before he took the helm of EPA.

“We are thankful to the court for granting our motion to postpone oral argument,” EPA spokeswoman Liz Bowman said in an email. “In light of President Trump’s pro-growth agenda, EPA continues to carefully review the broad implications of the 2015 ozone standard and ensure that we are supporting American jobs and protecting human health and the environment.”

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But Earthjustice attorney Seth Johnson, who is suing the agency over the standard, said in an email that any delay in implementing the tighter standards “will likely result in unnecessary asthma attacks and deaths.”