Air pollutants are separated into two categories: primary pollutants and secondary pollutants.
污染物可分为两类别：主要染物及次级污染物。
Motor vehicles are the primary source of several important air pollutants: carbon monoxide, volatile organic compounds, and nitrogen oxides.
机动车辆是几种重要的空气污染物的主要来源：一氧化碳、挥发性有机化合物，和氮氧化物。
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