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News•Staff•December 28, 2005

Optima's Opus hybrid receives CARB certification

The diesel hybrid combines ISE, Siemens and Cummins technology.

News•Staff•October 18, 2005

CARB backs off rigid emissions standards

California agency may raise the maximum emissions level for new transit buses.

News•Staff•November 14, 2003

California's transit bus emissions rules could be modified

State's air-quality regulators consider expanding restrictions to all transit agencies.

Articles•Staff•May 1, 2002

CARB study measures CNG, diesel bus emissions

Buses running on both compressed natural gas and ultra-low-sulfur diesel fuel, with the proper emission controls in place, can attain significant reductions in toxic emissions.

Articles•Staff•January 1, 2001

CARB amendments close emissions gap

The California Air Resources Board (CARB) proposed amendments to the certification requirements for new heavy-duty diesel engines (HDDE) sold in the state in 2005 and 2006.

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