Sensitivity of predicted pollutant levels to urbanization in China

► We model urbanization impact on air quality in JJJ and YRD areas. ► Urbanization increases T-2, decreases wind speeds and dew points, and enhances PBL heights. ► Ozone simulations rise after urbanization, but with different diurnal pattern in two areas. ► After updating land cover data, mean errors between simulations and observations are reduced in both urban and base points.