Abstract：An electrical low-pressure impactor (ELPI) with an air dilution system was employed to investigate the PM emission characteristics of industry source, traffic source, biomass combustion and cooking fume. The result showed that, the particle number concentration of coal boilers and diesel traffic source presented one single peak with the range of 0.20 to 0.48μm, the biomass combustion and cooking fume presented double peak style, the peak appeared in the nuclei-mode (0.02~0.07μm) and accumulation mode (0.2μm) respectively, the cement kiln existed double peak too, at the round of 0.12μm and 1.23~1.96μm. The peak of mass concentration appeared in the coarse particle mode mostly in all source, and the diesel traffic source had higher level. The particle number concentration main accumulated in the accumulation mode, the fraction of coarse particle mode less than 1%, and the mass concentration major accumulated in the coarse particle mode, and the fraction of nuclei-mode less than 0.1%.
