Green Groups File New Challenge to ‘Once in, Always In’ Air Rule

Environmental Defense Fund, Environmental Integrity Project, and other organizations took the EPA to court, challenging a rule that partially restores requirements for pollution sources that used to emit over a certain threshold.

Hoosier Environmental Council, Natural Resources Defense Council, and the Sierra Club joined the petition, which was filed Tuesday at the US Court of Appeals for the District of Colombia Circuit.

Known as ‘once in, always in,’ the rule ensures that pollution sources that shifted from “major” sources to lower “area” sources remain locked into more stringent controls. The first Trump administration reversed the rule, and the EPA revived ...