As American car buyers cautiously dip their toes into the world of electric vehicles, pondering issues such as cost, charging times and driving range, big businesses and some government agencies are going in headfirst.

The Antelope Valley Transit Authority, which serves some 450,000 residents in parts of Los Angeles County, wants to be the first transit agency with an all-electric bus fleet. It hopes to ditch all its diesel vehicles by the end of the year and replace them with 80 fully electric versions.

Reducing pollutants is a high priority for Antelope Valley, which includes the cities of Palmdale and Lancaster, because the area has the highest rate of asthma and deaths from respiratory diseases in the county, according to the county health department. “This switch-over makes sense for the environment,” said Len Engel, the transit authority’s executive director.