To investigate the distribution of inorganic elements concentrations of aerosol PM2.5 and characteristics of a single source and polycyclic aromatic hydrocarbons (PAHs) contaminations, two sampling site were set up, one being in the urban area (around Nanjing University in the Gulou district) and the other in the suburb region (on the campus of Nanjing University of Information Science and Technology), operating for December of 2002 to December of 2003 and also from July to August, 2005 to perform PM2.5 sam...