EPA's inspector general is examining how the agency's handled a key aspect of its hazardous air pollutant program.

An organization comprised of the heads of state environmental agencies has hired a former top EPA official as its second executive director in less than a year.

President Trump may have no stauncher ally than Bob Murray, head of Murray Energy Corp. But when lawyers take their seats in a federal courtroom tomorrow, the Ohio-based coal giant will be among the challengers going head-to-head with the Trump EPA during oral arguments over the agency's 2015 ground-level ozone standard.

EPA officials heard clashing views this morning about a proposed rule to ease application of its 2015 emissions standards for some new wood-burning heating systems.

Environmental groups have taken EPA back to court over alleged foot-dragging in confronting Fairbanks, Alaska's long-standing soot problem.