中文摘要：

与在中国的快速的经济生长，人为的反应的氮(Nr ) 排出物非常在最后二或三十年加倍。大气的 Nr 污染在象北京那样的大城市特别是在中国的一颗环境担心。为了识别排放的影响，在大气的 Nr 污染上采购原料，我们测量了大气的 Nr 集中和他们的同位素的作文(¹⁵ N ) 在三个典型地点的动力学：在到 2011 年 3 月的从 2010 年 4 月的北京的垃圾堆，猪农场和道路交通地点。被动刺绣花样被用于监视氨(NH ₃) 和氮二氧化物(没有 ₂), 二主要 Nr 种，当时他们的 ¹⁵ N 价值被与质量相结合的一个散开方法测量分光计途径。垃圾堆和猪农场的肥育的房子的未加工的水水池是有是的吝啬的 NH ₃ 集中的重要 NH ₃ 来源 2,829 和 2,369

英文摘要：

With rapid economic growth in China, anthropogenic reactive nitrogen （Nr） emissions have more than doubled over the last two or three decades. Atmospheric Nr pollution is an environmental concern in China especially in megacities such as Beijing. In order to identify the impact of emission sources on atmospheric Nr pollution, we measured atmospheric Nr concentrations and their isotopic composition （δ15N） dynamics at three typical sites： landfill, pig farm and road traffic sites in Beijing from April 2010 to March 2011. Passive samplers were used for monitoring ammonia （NH3） and nitrogen dioxide （NO2）, two major Nr species, while their δ15N values were measured by a diffusion method combined with mass spectrometer approach. The raw water pool of the landfill and fattening house of the pig farm were important NH3 sources with mean NH3 concentrations being 2,829 and 2,369 μg/m3, respectively, while the road traffic site was a minor NH3 source （10.6 μg/m3）. NH3 concentrations at sites besides the landfill and roads were high in summer and low in winter due to the annual variation of temperature and the change of emission source intensity. In contrast, the NH3 concentrations inside the pig farm house were high in winter and low in summer, for the barn windows were open in summer and closed in winter. The mean NO2 concentrations were 89.8, 32.9 and 23.0 μg/m3 at the road traffic, the landfill and pig farm sites, respectively. Due to vehicle fuel combustion, NO2 concentration at the road traffic was the highest among the three sources, and the road traffic was a main NO2 emission source. PM10, pNH4＊ and pNO3- concentrations in particulate matter were higher in summer than in winter （except PM10 for the pig farm）. The δ15NH3 values ranged from -19.14‰ to 7.82‰, with an average of-0.05‰ for the landfill site, and the lowest values were observed in June and July. The δ15NH3 values for the pig farm site ranged from -29.78‰ to-14.05‰ with an average of-24.51‰, and the 515NH3 val