A numerical study was performed to evaluate the impact of urbanization caused by land-use change on surface meteorology factors and ozone (O3) in Shanghai.Urban land cover in 1993 and 2006 were chosen to represent two development periods of urbanization.The expansion of urban area,the function of urban canopy model and the emission of anthropogenic heat were considered as the characteristics of urban areas.The novel WRF-Chem modeling system was applied to simulate three 5-day O3 episodes in 2007,and four se...