众所周知,在一般情况下,气温是随着海拔高度的增加而降低的,平均每上升100米,温度约降低0.6度,这样,大气低层温度高,空气密度小;高层温度低,空气密度相对较大,造成了“头重脚轻”的现象,容易上下翻滚而形成对流,这样就会使低层特别是近地面层空气中的污染物和粉尘向高空移散,从而减轻在大气低层污染程度。 As we all know, under normal circumstances, the temperature decreases with the increase of altitude. Every 100 meters above average, the temperature decreases by about 0.6 degrees. In this way, the low temperature in the atmosphere is high and the air density is small; the temperature in the high layer is low, and the air density is relatively low. Large, resulting in a “top-heavy” phenomenon, easy to roll up and down to form convection, this will make the low-level, especially in the air near the ground floor of pollutants and dust to the upper air to reduce the level of pollution in the lower atmosphere.