At times, the boards did push back against the Trump administration, such as when the Science Advisory Board determined that a major repeal of a water pollution rule did “not incorporate best available science.”

In a recent interview, Regan suggested that the agency may revisit those decisions on acceptable pollution levels. “We want to take a close look at ozone,” he said. “We want to take a look at all the NAAQS [National Ambient Air Quality Standards] that we believe are questionable.”

Genna Reed, a senior analyst at the Union of Concerned Scientists, a research and advocacy group, said that reconstituting the panel will aid in any effort to bolster of air quality standards.

“It only makes sense for the agency to go back to the drawing board,” she said.