refers to particulate matter (PM) with a diameter of smaller than micrometers flying in the atmosphere. The high concentration of seriously affects the health of people and animals. Using Aerosol Optical Depth (AOD) index achieved from satellite images is possible to estimate and monitor the variation of . This study observes the variation of AOD and the maximum concentration over three sub-regions in northern Vietnam based on the daily MODIS aerosol product and measured at a ground station. |