机动车在造福人类的同时,也给其生存环境带来了越来越多的污染物,直接影响着人体健康。究其原因,一是过去我国机动车排放限值标准相对宽松,排放控制技术比较落后;二是机动车产量近年来迅速增长,而城市道路交通建设不能满足车辆增长的需要,造成污染物排放总量增加和城市大气环境质量(品质)恶化。防治机动车排放污染是全社会的一个重大 While mankind benefits mankind, it also brings more and more pollutants to its living environment, which directly affects human health. The reason is that in the past China’s motor vehicle emission limits are relatively loose, emission control technology is relatively backward; second is the rapid growth of motor vehicle output in recent years, and urban road traffic construction can not meet the needs of vehicle growth, resulting in total pollutant emissions The increase of the quality and the deteriorating quality (quality) of the urban air environment. Prevention and control of motor vehicle emissions pollution is a major social