In order for California to promulgate vehicle emission standards without violating the Clean Air Act, it must receive a waiver from the EPA for any state law that regulates vehicles covered by the Act ...

In 2023, the Colorado Air Quality Control Commission adopted an Advanced Clean Truck (ACT) rule. This rule will take effect ...

Citing expected opposition from the incoming Trump administration, California withdrew its federal waiver petitions to enact ...

The state withdrew its pioneering clean air regulations for diesel trucks and trains, acknowledging they wouldn’t win federal approval. The state intended to end sales of trucks powered by fossil ...

Congressman Doug LaMalfa releaseda statement regarding the California Air Resources Board’s decision to withdraw its Clean ...

The EPA had yet to grant a waiver for CARB’s requests, which were expected to face opposition from president-elect Trump.