One of the rules California pulled after the EPA failed to approve it would ... that U.S. EPA was unable to act on all the requests in time, the withdrawal is an important step given the ...

Seeing the writing on the wall, the California Air Resources Board already has withdrawn its waiver request for the U.S. Environmental Protection Agency’s approval of its Advanced Clean Fleets ...

(AP) — California ... its requests for federal approval to implement stricter emissions rules for locomotives and semi-trucks because the U.S. Environmental Protection Agency had yet to ...