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PM2.5 particles were collected on polypropylene filter at a daily base in Beijing from March,2013 to April,2014.Then,water-soluble ions and metal concentrations were detected using an Ion Chromatography(IC)and an Inductively Coupled Plasma Optical Emission Spectrometry(ICP-OES),respectively.The objective of this study was to investigate the characteristics of air pollution in associated with high aerosol loading in Beijing megacity.