An EPA advisory panel will probe agency staffers’ handling of the science behind their preliminary conclusion that the ozone limit doesn’t need tightening and could heighten pressure to change the ...

EPA is restarting review of a high-stakes decision on ground-level ozone standards in a step that short-circuits the prospects for any imminent action to tighten limits on the lung-damaging pollutant.

Pennsylvania dodged a bullet at the end of July when business and manufacturing groups put the brakes on President Obama’s attempt to change EPA ozone standards. The Clean Air Act requires a review of ...