【摘要】 为促进厦门岛向“清洁空气”目标前进，利用2015—2019年厦门岛国控大气监测站提供的逐时数据，结合HYSPLIT后向轨迹模型，展开PM_2.5污染特征、污染月传输及轨迹分析。结果表明：研究期厦门岛PM_2.5年平均质量浓度由2015年的（29.59±13.22）μg/m³降至2019年的（24.08±11.58）μg/m³。1—3月及11月PM_2.5月均质量浓度相对较高（31.68～35.86μg/m³）,6—8月则相对较低，均在20μg/m³以下，具有“冬高夏低，春降秋升”的季节变化特点，污染月主要集中在1、2、3和11月。在污染集中的月份，温度和湿度对PM_2.5影响不显著，而风速是影响PM_2.5的主要因素。短距离气流输送是造成厦门岛PM_2.5污染的主要原因，而来自西北及偏北方向的长距离输送加剧了厦门岛PM_2.5污染。冬季污染潜在源区为闽东部沿海区域及浙、皖、赣、粤与闽交界区域，具有污染轨迹数高、短距离输送的特点。春季污染潜在源区集中在川、赣、湘等地区，具有污染轨迹数占比高、长距离输送的特点。更多还原

【Abstract】 With objective of achieving Xiamen’s “Clean Air” goal, the analysis of pollution characteristics, transportation pathways and potential sources of PM_2.5 in Xiamen Island were carried out from 2015 to 2019.The results show as following: the annual average PM_2.5 concentration decreased from（29.59 ± 13.22） μg/m³ to（24.08 ± 11.58） μg/m³ during the study period.The monthly average concentration of PM_2.5 is relatively high from January to March and December, between 31.68 μg/m³ and 35.86 μg/m³.The monthly average concentrtion of PM_2.5 from June to August is relatively low, all below 20 μg/m³.Seasonal variation characteristics show “high in winter and low in summer, falling in spring and rising in autumn”,and the pollution months were mainly concentrated in January, February, March and November.By ignoring the seasonal effect, wind speed was the significant factor affecting PM_2.5,compared with temperature and moist in these pollution months.Backward trajectory analysis indicated that the regional and short-distance sources from the northeast in Fujian were identified as the major contributors of PM_2.5,and long-distance transport from the northwest and north also contributes to PM_2.5 pollution in Xiamen Island.In winter, the major source regions of PM_2.5 were mainly in the coastal area of Eastern Fujian and the border area between Zhejiang, Anhui, Jiangxi, Guangdong and Fujian, with the characteristics of high pollution tracks, and short distance transportation.The potential source areas of PM_2.5 were mainly distributed from Sichuan, Jiangxi, Hunan, Guangdong in Spring, which was characterized by high proportion of pollution tracks and long-distance transport.更多还原