Appropriately, a higher concentration of the secondary pollutant is stably held for a longer downwind distance.
相应地，一个较高的次生污染物浓度将稳定地维持在一个较长的下风距离上。
As a result of chemical conversion and decay, the primary pollutant decreases with the downwind distance more rapidly, especially as the mesoscale distance further than 10 km.
由于化学转换和衰减的作用，初生污染物随着下风距离而较快地减少，特别是在10公里以后的中距离上更加明显；
It is found that the maximum concentration often occurs near source through intensive vertical diffusion, and the values of concentration decrease with the distance downwind rather rapidly.
发现由于垂直扩散较强，最大浓度常于近源处发生，且向下风方浓度衰减较快。
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