Aaron Szabo, the head of the US Environmental Protection Agency’s air program office, is resigning, according to multiple reports. Szabo tells employees that he will step down later this month. His departure follows his leadership of the EPA air office during the Trump administration, a period that has included actions that reduce or roll back a range of air pollution limits. The reports describe Szabo as the top regulator overseeing air pollution policy within the EPA and his role in implementing the administration’s approach to environmental regulation. Bloomberg and The New York Times both report the resignation and confirm Szabo’s plan to leave his position after years of directing the agency’s air-related regulatory work. The sources do not provide details on his next role or name a successor. The resignation is presented as an internal leadership change at the EPA’s air office and as a shift away from Szabo’s oversight of prior regulatory decisions and policy revisions.