To investigate the pollution characteristics of water soluble ions in PM2�5 and PM10 under severe haze days, both PM2�5 and PM10 samples were collected in a city of northeast China under severe haze days during October 20-22, 2013. Nine water⁃soluble ions in PM2�5 and PM10 including F-, Cl-, NO3-, SO4 2-, Na+, NH4+, K+, Mg2+and Ca2+ were analyzed. The results showed that the concentrations of all water⁃soluble ions mass concentration in night were higher than those in day time, with a ratio of 1�68 for PM2�5 in haze days. The concentrations of SO4 2-, NO3-and NH4+were higher and their percentage in PM2�5 were 11�03%, 8�3% and 7�39% in haze days, the same results in PM10 were obtained. The percentages of K+and Ca2+in haze and non⁃haze periods were similar. Based on the ratio of different ions, the pollution from stationary sources were higher than that from mobile sources in haze days, this showed that meteorological factors had greater influences. In comparison with the data of water soluble ions during October and November of 2009, the concentrations from mobile sources were on the rise.%为掌握雾霾期大气PM2�5和PM10中水溶性离子污染特征，采集东北某市2013年10月20～31日发生严重雾霾期间大气PM2�5和PM10样品，分析颗粒物样品中9种水溶性离子（F－、Cl－、NO3－、SO42－、Na＋、NH4＋、K＋、Mg2＋和Ca2＋）的质量浓度．结果表明：各水溶性离子均表现为夜间质量浓度大于日间质量浓度，其在雾霾期PM2�5中的昼、夜质量浓度比为1�68；NO3－、SO42－、NH4＋等3种离子质量浓度较高，雾霾期PM2�5中质量分数分别为11�03％、8�3％和7�39％，PM10中也有类似结果．K＋和Ca2＋在PM2�5和PM10中，雾霾期和非雾霾期质量分数变化不大．根据各离子比值，可以判定雾霾期固定源对颗粒物污染的贡献更大，说明雾霾期城市气象因素对大气颗粒物污染影响较大．对比2009年10、11月水溶性离子数据发现移动源污染贡献在增加．
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