Daily and Hourly Surface PM2.5 Estimation From Satellite AOD

National Oceanic and Atmospheric Administration (NOAA) United States Environmental Protection Agency (USEPA) have been deriving surface particulate matter with a median diameter of 2.5 µm or less (PM2.5) from satellite aerosol optical depth (AOD) over Continental (CONUS) using climatological PM2.5-AOD regression relation. However, because relation can change time, this method large errors when the deviates values. In work, geographically weighted (GWR) model is used to estimate PM2.5 AOD. The parameters are derived dynamically in daily hourly manner measurements AOD satellite. evaluated Visible Infrared Imaging Radiometer Suite (VIIRS) Advanced Baseline Imager (ABI) CONUS, Himawari Taiwan. algorithm performs much better than simple relationships. estimated VIIRS has cross validation (CV) R2 0.59 measured PM2.5, bias 0.09 µg/m3 Root mean square error (RMSE) 5.66 µg/m3. estimates ABI CV 0.44, 0.04 µg/m3, RMSE 4.53 will run near-real-time at NOAA provide air quality community CONUS.