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%.%采用荷电低压颗粒物撞击器(ELPI)和稀释采样系统研究重庆市工业源、交通源、生物质燃烧以及餐饮业油烟等各类燃烧过程的颗粒物排放特征.结果表明：燃煤锅炉以及各类柴油交通源颗粒物数浓度峰值都表现出单峰型的变化特征，峰值主要出现在0.20~0.48µm之间；生物质燃烧和餐饮业油烟颗粒物的数浓度都呈现出双峰型的变化趋势，分别出现在核模态(0.02~0.07µm)和积聚态(0.2µm)；水泥窑炉的数浓度也出现双峰型变化特征，分别出现在积聚态(0.12µm)以及接近粗颗粒物态的1.23~1.96µm粒径范围处.各污染源颗粒物质量浓度峰值主要出现在粗粒径态，交通源排放的颗粒物质量浓度相对较高.各类污染源数浓度分布主要集中在积聚模态，粗颗粒态的数浓度累计贡献都不到1%；质量浓度主要分布在粗颗粒态，核模态的质量浓度贡献都小于0.1%.
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