The California Air Resources Board said Tuesday it withdrew its requests for federal approval to implement stricter emissions ...

California has withdrawn requests for the EPA to give the state authority to enforce rules limiting emissions from diesel-powered trains and big rigs SACRAMENTO, Calif. -- California’s efforts ...

California Pulls Back EPA Requests for Approval to Phase Out Diesel-Powered Trains and Big Rigs SACRAMENTO, Calif. (AP) — California’s efforts to limit pollution from diesel-powered trains and ...