California Air Resources Board

While the state has made significant progress in expanding the use of electric, hybrid and alternative-fuel vehicles, the transportation sector continues to be the largest single contributor of greenhouse gases released into our atmosphere. These emissions account for approximately 40 percent of statewide emissions in 2016 (and even as high as 50 percent if we consider refinery and production emissions necessitated by our transportation sector).

As CARB looks for ways to meet our 5-million zero emission vehicle target by 2030, the conversion of public and private fleets to zero emission cars and trucks offers an important opportunity to get a large number of carbon-polluting fleet vehicles off the road.