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；

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.

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在模式中考虑了地形、沉积、化学衰减和混合层顶多次反射等影响因素的作用。

First, the paper puts forward a smoke-puff trajectory model in which topography, deposition, chemical elimination and reflex effects within the mixture layer have been taken into consideration.

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