选择2003年1月21日、2月18日和2月20日三个晚上为研究个例观测了台北大气气溶胶中的可溶性阴离子的浓度变化，并利用后推气流轨迹模型结合离子质量分数和离子间相关性分析，研究了不同长距离输送过程对台北大气污染的影响。研究结果表明：台北大气气溶胶中可溶性阴离子主要由Cl-、NO2-、NO3-和SO42-组成，其中SO42-占可溶性阴离子质量浓度的60-90%，NO3-次之，占9-22%，两者具有较强同源性；Cl-和NO2-所占比例较小，NO2-浓度不容忽视；海盐源气溶胶的长距离输送可以降低台北市大气污染，沿海大陆地区气溶胶的长距离输送可能增加台北市大气污染，沙尘气溶胶的输送不一定加重台北市大气污染。

Three days were selected to study the effect of different long-distance transportation on atmospheric pollution in Taipei, China. Concentration of water-soluble anion of aerosols in Taipei was measured. Back trajectory of air masses, mass ratio and sources of water-soluble anions were analyzed. The results showed that water-soluble anion of aerosol in Taipei was composed of Cl-, NO2-, NO3- and SO42-. SO42- was the major component, which accounted for 60-90% in mass, and then following is NO3- which accounted for 9-22% in mass. SO42- and NO3- were likely from the same source. Concentration of NO2- could not be ignored. Long-distance transportation of sea-salt aerosol could decrease atmospheric pollution in Taipei. However, long-distance transportation of aerosols from coastland of China could increase atmospheric pollution in Taipei. Long-distance transportation of dust was not always increase atmospheric pollution in Taipei