近年来,随着人们生活水平的不断提高,机动车保有量正在急速增长,随之而来的机动车尾气污染问题也日益严重。机动车排气对城市大气环境的污染日益突出,使得机动车排气污染在城市环境空气中的分担率不断提升。环境空气污染性质从煤烟型向交通混合型转变。成为主要的大气污染来源,不仅污染了空气质量而且影响了城镇居民的健康水平。 In recent years, with the continuous improvement of people’s living standards, the number of motor vehicles is rapidly increasing, and the consequent problem of motor vehicle exhaust pollution is also aggravating. Motor vehicle exhaust pollution of the city’s atmospheric environment has become increasingly prominent, making the motor vehicle exhaust pollution in urban ambient air, the rising share of the rate. The nature of ambient air pollution has shifted from soot to traffic mix. Become the main source of air pollution, not only pollute the air quality but also affect the health level of urban residents.