当前我国空气污染问题日益严峻，汽车排放有害污染物是污染的重要来源。
Now the pollution become more serious, the exhaust of the car is the main source.
有毒有害空气污染物的环境影响是国内外研究的热点，而机动车排放是其重要源之一。
Studying the environmental effects of toxic air pollutants is currently very important in the world.
有毒有害空气污染物的环境影响是国内外研究的热点，而机动车排放是其重要源之一。
Studying the environmental effects of toxic air pollutants is currently very important in the world.
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