入秋时节,雾霾来势汹汹,让华北大部分地区再度遭遇“心肺之患”。春夏季节才下眉头的雾霾,如今重整旗鼓,秋冬季节周而复始,又登上了人们的心头。关于雾霾的成因,一度众说纷纭,目前科学家们较一致的说法是工业排放、汽车(机动车)尾气排放、冬季供暖、秸秆焚烧、建筑粉尘、中国式烹调、空气流动性差、地形条件等。汽车尾气排放毫无悬念地成为雾霾的重要“元凶”之一,那么,在环境问题日益凸显与行业内大力倡导绿色维修的今天,对尾气排放的有效监控也越来越被重视。 Fall season, menacing haze, so that most parts of North China once again suffered “heart and lung suffering ”. Only in the spring and summer haze fog, now regrouped, autumn and winter seasons, and boarded the people’s minds. About the causes of haze, once divergent opinions, scientists are more consistent argument is that industrial emissions, automobile (motor vehicle) exhaust emissions, winter heating, straw burning, construction dust, Chinese cuisine, poor air mobility, terrain and so on. Automobile exhaust has no suspense to become one of the “culprit” of haze. Nowadays, with the environmental problems becoming more and more prominent and green maintenance advocated in the industry, more and more attention is paid to the effective monitoring of exhaust emissions.