科学60秒:夜间充电益处大
Plug-in electric hybrids give off ___2___ than gas guzzlers. And when they’re running on battery power, they generate no fumes at all. But there’s a catch. The power plants that make the electricity you use to recharge the battery produce plumes of pollution. But how much ozone gets produced depends on ___3___.
Electric power plants that burn fossil fuels release hydrocarbons and nitrogen oxides. And when sunlight hits those compounds, ozone forms. At night, however, well, it’s dark. And the compounds ___4___ in large part before the sun comes up.
Scientists modeled how much ozone would be generated if the cars were charged at three different times: overnight, just before they’re driven or just after. And they found that drawing electricity from the grid ___5___ is best. So to drive green, plug in, lay down and get some ozone-free Zs.
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