Research on Air-quality Change with MODIS-derived AOD Data in Corresponding to 2008 Olympic Environment Monitoring Projects

Using aerosol optical depth (AOD) retrieved from temporal MODIS data to monitor region air-quality change. First, AOD images are retrieved from temporal MODIS data by a well-validated method. Based on four different regions in Beijing, AOD changing graphs are obtained from the retrieval images. The yearly graphs of AOD and PM10 in 2004 are compared. Results indicate that their total trends are good in accordance with each other. Meanwhile, the monthly averaged AOD graphs from June to September between 2003 and 2005 are compared at all the four regions. It turns out that monthly mean AOD in 2003 is higher than that of 2005 at most time, which implies air-quality is improved during 2003 and 2005.