科学家承认“汽车尾气”是雾霾元凶

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