An article from
Dive Brief
The D.C. Circuit rejected a challenge from states and industry groups, leaving the National Ambient Air Quality Standards for fine particulates in place as litigation over implementation continues.
Published July 1, 2026
The Mill Creek Generating Station, a coal-fired power plant in Louisville, Ky., on Feb. 14, 2026. On June 26, 2026, an appeals court denied a challenge to a 2024 Environmental Protection Agency rule revising the "soot standard" for fine particulate matter from power plants, oil refineries and other industrial operations.
