EPA takes first step to impose ozone controls on Pa.

By Sean Reilly | 09/15/2021 02:14 PM EDT

EPA is gearing up to formally revoke approval of a Pennsylvania plan to curb power plant emissions that contribute to […]

A view of the skyline of downtown Philadelphia. Philadelphia is in nonattainment for both EPA's 2008 and 2015 ozone standards. | Ric Tapia/AP Photo