科学家承认“汽车尾气”是雾霾元凶
<p>从昨天下午开始，浓重的雾霾又开始笼罩京城。不久前中科院出了一个研究结果，称汽车尾气及垃圾焚烧仅占<span word="PM">PM</span>2.5</p><p><span word="Although">Although</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="not">not</span> <span word="agreed">agreed</span> <span word="on">on</span> <span word="an">an</span> <span word="exact">exact</span> <span word="percentage">percentage</span> <span word="of">of</span> <span word="vehicle">vehicle</span> <span word="exhausts">exhausts</span>' <span word="contribution">contribution</span> <span word="to">to</span> <span word="fine">fine</span> <span word="particulate">particulate</span> <span word="matters">matters</span> <span word="in">in</span> <span word="big">big</span> <span word="cities">cities</span>, <span word="they">they</span> <span word="do">do</span> <span word="agree">agree</span> <span word="it">it</span> <span word="is">is</span> <span word="a">a</span> <span word="major">major</span> <span word="source">source</span> <span word="of">of</span> <span word="pollution">pollution</span>.</p><p>尽管科学家们对于汽车尾气在大城市<span word="PM">PM</span>2.5 汽车尾气的英文表达是<span word="vehicle">vehicle</span>/<span word="automobile">automobile</span> <span word="exhausts">exhausts</span>，它和<span word="soil">soil</span> <span word="dust">dust</span>目前为了减少汽车尾气，各大城市都开始实行<span word="restrictions">restrictions</span> <span word="on">on</span> <span word="purchasing">purchasing</span> <span word="motor">motor</span> <span word="vehicles">vehicles</span></p>
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