煤乡街头,南来北往,东奔西忙的汽车、摩托车、机动三轮车以及各种类型的拖拉机在川流不息地奔跑着。但这些车辆大都是拖着一根长长的尾巴,把一条条街道笼罩在烟雾中。汽车肆无忌惮时排放尾气,给过往行人以“呛”的感受。其实这尾气岂止是呛,更多的是毒。从汽车尾气中排放在低空环境中的一氧化碳(CO)、碳氢化合物(HCx)、氮氧化物(NOx)、悬浮微粒 The streets of the coal township, south to north, busy cars, motorcycles, motorized tricycles and various types of tractors are running in endless streams. However, most of these vehicles dragged a long tail and shrouded a street in the smoke. Exhaust gas is emitted when the car is unscrupulous, giving passers-by the feeling of “squeaking.” In fact, this exhaustion is more rampant and more toxic. Carbon monoxide (CO), Hydrocarbons (HCx), Nitrogen oxides (NOx), Suspended particulates emitted from automobile exhaust in low-altitude environment