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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PM2.5 Although scientists have not agreed on an exact percentage of vehicle exhausts' contribution to fine particulate matters in big cities, they do agree it is a major source of pollution. 尽管科学家们对于汽车尾气在大城市PM2.5 汽车尾气的英文表达是vehicle/automobile exhausts，它和soil dust目前为了减少汽车尾气，各大城市都开始实行restrictions on purchasing motor vehicles | 
