California’s lawsuit over Congressional attempt to end the state’s ZEV waivers targets questions of the action’s legality.

California and ten other Democrat-led states sued the Trump administration for repealing the state’s authority to impose a ...

Trump signed measures on Thursday revoking waivers for the state’s mandates that clean up car and truck exhaust and ramp up ...

Legislation signed by President Trump impacting California’s clean truck rules immediately brought a lawsuit from the state.

Colorado Attorney General Phil Weiser has joined a coalition of other state attorneys general in filing a lawsuit challenging ...

Ten other states that are enforcing California’s emissions rules joined the lawsuit — Colorado ... more stringent vehicle standards in the 1967 Clean Air Act. Before now, the federal ...