North Carolina is using $30.1 million from its share of the Volkswagen settlement to replace “some of the dirtiest diesel buses in the state.”

More than three dozen states have taken sides in a court fight over the EPA's reinstatement of California's strict tailpipe emissions standards.

Attorneys general from 19 states and D.C. voiced support for a plan to require companies to include climate change risk assessments in their SEC reports.

New Jersey is tackling carbon and other air pollution at its ports with new rules aimed at promoting the adoption of electric equipment for moving cargo.