Impact of Large Cities' Expansion on Air Pollution

For investigating the impact of large citiespsila expansion on air pollution, some numerical experiments are employed by adopting the typical meteorological condition in this paper. The simulation results show that the urban development has great effect on the transportation and diffusion of pollution. The existent of Beijing downtown area leads to the decrease of the total allowable emission about 18.02 t-d
^-1
. Identically, the contribution ratio of the surrounding towns expanding to PM10 concentration of downtown area reaches about 0.192 t-d
^-1
.