With harsher rules in place, California has been able to address issues that the federal rules were not likely to tackle.

California environmental leaders are calling on state agencies to prioritize investing in active transportation and public ...

A newly formed citizen advisory board tasked with overseeing Orange County’s transportation issues held its first meeting ...

The company, a subsidiary of ZO Motors, plans to manufacture zero-emission commercial vehicles at the new 210,000-square-foot ...

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

More public buses are ditching diesel engines for battery packs and hydrogen fuel-cell power. But in recent years, this newer, greener tech has encountered industrywide ...

A door was apparently not fully closed on a homebuilt airplane that crashed in Southern California earlier this month.

Flood watches were in effect for burn areas from recent fires that broke out around the Pacific Palisades neighborhood in Los ...

A witness saw the left main cabin door open during flight, and an examination of the door showed the interior handle was not ...

Four cities in Southern California are opposing an EPA processing site for "hazardous" waste from Los Angeles County's ...