“汽车尾气”用英文怎么说？

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来源的4%，这一结果与此前环保部门公布的数据大相径庭，令人大跌眼镜。但很快中科院又发表声明称该研究的数据极大地低估了汽车尾气对PM2.5的“贡献”。

请看《中国日报》的报道：

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（空气中的可吸入微小颗粒物）来源中所占百分比尚未达成一致意见，但他们一致认为汽车尾气是主要的空气污染源。

汽车尾气的英文表达是vehicle/automobile exhausts，它和soil dust（土壤尘）、fire coal（燃煤）、biomass burning（生物质燃烧）、waste incineration（垃圾焚烧）、industrial pollution（工业污染）一起被认为是北京PM2.5主要污染源。

目前为了减少汽车尾气，各大城市都开始实行restrictions on purchasing motor vehicles（机动车限购政策），同时通过charging higher prices for diesel fuel and parking（提高汽油价格和停车费）来提高机动车的usage costs（使用成本）。

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