There is increasing interest in understanding the origin of atmospheric sources of water soluble organic nitrogen (WSON) and its impact on anthropogenic nutrient pollution for terrestrial and marine ecosystem. This study aims to investigate the role of Asian dust storm on atmospheric water soluble organic nitrogen. PM_2.5 samples were collected simultaneously from April 1 to May 21, 2012 at the urban area of Zhangjiakou, Hebei province and the rural area of Tianjin near the coastal line, respectively. PM_2.5 mass and chemical compositions including ions, total metals, WSON, organic carbon and elemental carbon were adopted for source apportionment using receptor modeling. The sources of PM_2.5 mass at the two sampling sites were coal combustion, secondary source, industrial source, mobile source, dust source and biomass burning. The Asian dust storm was observed at the two sampling sites from April 25 to 28, 2012. Significant increases in WSON concentration from ~1.6 μg m⁻³ to 12 μg m⁻³ were found at the urban site (S1), and from ~1.3 μg m⁻³ to 18 μg m⁻³ at the coastal site (S2), respectively. Source apportionment results showed that the contributions to WSON from dust source increased from ~10% during normal days to ~45% during dust storm days, while the contributions from other sources kept relative stable (<5%) within normal days and dust storm days. The largest sources contributing to WSON at the two sampling sites were secondary sources and fuel combustions. Our study highlights the important role of Asian dust storm in the cycles of WSON in urban and coastal environments.

人们越来越了解大气中的水溶性有机氮（WSON）的来源及其对陆地和海洋生态系统的人为养分污染的影响。本研究旨在调查亚洲沙尘暴对大气水溶性有机氮的作用。2012年4月1日至5月21日同时在河北张家口市区和沿海沿线的天津农村地区同时采集了PM _2.5样品。使用受体模型，采用PM _2.5质量和化学成分（包括离子，总金属，WSON，有机碳和元素碳）进行源分配。PM _2.5的来源这两个采样点的质量分别是燃煤，次生源，工业源，移动源，粉尘源和生物质燃烧。观察到亚沙尘暴在两个采样点从4月25日至28日，在从〜WSON浓度2012的显着增加1.6微克米^-3至12微克米^-3物在城市站点（S1）发现的，从〜 1.3μgm ^-3至18μgm ^-3分别位于沿海地区（S2）。污染源分配结果表明，尘埃源对WSON的贡献从正常日的约10％增加到沙尘暴日的〜45％，而其他来源的贡献在正常日和沙尘暴日保持相对稳定（<5％）。 。在两个采样点造成WSON的最大来源是次要来源和燃料燃烧。我们的研究强调了亚洲沙尘暴在城市和沿海环境中WSON循环中的重要作用。