Using the RBLM Chem model and the high resolution urban architecture data in Hangzhou, this paper quantitatively analyzed the direct environmental effect of urban vegetation through sensitivity tests. The results showed that urban vegetation generally increased the dry deposition velocity of air pollutants. In summer, urban vegetation increased the dry deposition velocity of SO2, NO2, O3, PM2.5 by 0.15 cm/s, 0.10 cm/s, 0.02 cm/s, 0.05 cm/s, respectively. But the effect was not significant in winter. This increasing effect was greater during the day than at night. Urban vegetation could significantly reduce the concentration of air pollutants in urban area. In the day or at night, this effect varied with species. |