Half the world’s air pollutants derive from transportation sources, and diesel buses are especially harmful. Chinese automaker BYD is tackling that problem with its battery-powered bus, which can go a full day without charging—a first. And it costs less to maintain over a lifetime than diesel equivalents. That’s good for China’s smog-choked cities—and the U.S., where half the population lives in areas that don’t meet federal air standards. BYD expects to sell 6,000 of the models in China this year—and is expanding in the U.S. with a new California factory.
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