本文以西安市为例，阐述了轻型汽油车辆排放污染对城市环境的影响。
In this paper, we take Xian as example for explaining that emission pollutant of light duty gasoline vehicles affect environment of Xian city.
针对70多辆轻型汽油车的测试表明：车辆实际道路得到的排放因子比实验室法规情况下测量的排放因子要高的多。
The emissions test of 70 light-duty gasoline car indicated that real-world vehicles emission factors is higher than the laboratory test results.
针对70多辆轻型汽油车的测试表明：车辆实际道路得到的排放因子比实验室法规情况下测量的排放因子要高的多。
The emissions test of 70 light-duty gasoline car indicated that real-world vehicles emission factors is higher than the laboratory test results.
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