Components of atmospheric particles were studied by XFR, XRD, IR and SEM, and the results show that they are basically the same in different parts of Hefei City. Mineral components of atmospheric particulates include illite, gypsum, chlorite, quartz, feldspar, calcite, dolomite and noncrystalline substances. There are abundant Ca, Pb Co, Cu and Zn in the particulates. Analytical results demonstrate that atmospheric particulates come mainly from concrete industry and traffic, and partly from air dust and soot of industrial stoves in Hefei City. There exists plenty of gypsum in atmospheric particulates, which account for the fact that SO 2 pollution is relatively severe in Hefei area.