Mishaps with equipment manufacturers, maintenance crews and power suppliers are threatening fleets’ transition from diesel engines.

The South Coast Air Quality Management District will hold a summit in Palm Desert to discuss the topic of Coachella Valley blow sand and dust, the agency announced Thursday. Riverside County ...

The Trump administration dismissed members of the Environmental Protection Agency’s Clean Air Scientific Advisory Committee and Science Advisory Board Tuesday, a day before the confirmation of new ...

FRESNO, Calif. (KFSN) -- The sale of new diesel trucks in California won't have to hit the brakes any time soon. That's ...

The plot has thickened in the ongoing saga of California OHV registrations following the sundowning of the Red Sticker ...