The uncertainties of the satellite-derived air pollutant concentrations lead to the uncertainties in the AAQI. To estimate the accuracy of the satellite-derived air pollutant concentrations, we compared the satellite-derived air pollutant concentrations with the ground-measuredconcentrations (Figure 3). In general, a good linear relationship was shown between the satellite-derived air pollutant concentrations and the ground-measured concentrations. The coefficient of determination (R2) between ground-measured PM10, PM2.5, NO2, and SO2 concentrations and corresponding satellite-derived concentrations could be as high as 0.68, 0.66, 0.72, and 0.72, respectively. The root mean square error was about 20.33, 16.45, 7.94, and 10.91, respectively. According to Equation (2), the corresponding transferred bias for AAQI was less than 13. The small bias of satellite-derived air pollution and AAQI demonstrates that estimation of ground air pollutant concentrations using satellite observations is reliable.