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

Researchers contributing to the ASCENT network of air quality sensors observed spikes in lead and chlorine downwind from the ...

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 ...

Love’s Travel Stops built a new travel center in California even as diesel was targeted for phase-out; now that’s not an ...