EPA, taking a step that critics say is superfluous, is advancing a formal rule to make a first-ever addition to its roster of hazardous air pollutants.

EPA Administrator Andrew Wheeler has given a final rebuff to an in-house watchdog's urgent recommendation on the steps needed to warn more than two dozen communities of the risks posed by an airborne carcinogen.

Acting EPA air chief Anne Austin is leaving her post just as she accepted it: quietly.

Northeastern states are again accusing EPA of unlawful foot-dragging in dealing with "good neighbor" plans to limit ozone-forming emissions from far outside their borders, according to a newly filed lawsuit.

A week before President Trump leaves office, EPA is facing its first lawsuit over one of his administration's most hard-fought environmental decisions: a rule leaving the standards for soot unchanged for at least another five years despite evidence that they aren't strong enough to protect public health.