Abstract Atmospheric reactive nitrogen (Nr) emissions and deposition have caused much damage to the global environment and also impacted human health. Determining long-term trends in atmospheric Nr concentrations and deposition is important for evaluating air quality and ecosystem effects and formulating control measures to reduce negative impacts. We measured monthly concentrations of NH3, pNH4+, HNO3, pNO3-, and NO2 and calculated their dry deposition rates using an inferential method from 2011 to 2018 at an urban site in Zhengzhou in the North China Plain. Inorganic N (NH4+ and NO3−) concentrations in precipitation and wet/bulk N deposition were also quantified in 2011, 2016, 2017 and 2018. The results showed high concentrations of atmospheric Nr species, with considerable variation in some species over the monitoring period. Annual mean NH3 concentrations significantly increased from 2011 to 2018 (p

中文翻译：

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2011-2018年华北某城区大气活性氮浓度及沉降趋势

摘要 大气活性氮（Nr）的排放和沉积对全球环境造成了很大的破坏，也影响了人类的健康。确定大气 Nr 浓度和沉积的长期趋势对于评估空气质量和生态系统影响以及制定控制措施以减少负面影响非常重要。我们测量了 2011 年至 2018 年华北平原郑州城市站点的 NH3、pNH4+、HNO3、pNO3- 和 NO2 的月浓度，并使用推理方法计算了它们的干沉降率。2011 年、2016 年、2017 年和 2018 年还对降水和湿/散氮沉积中的无机 N（NH4+ 和 NO3-）浓度进行了量化。结果显示，大气中 Nr 物种的浓度很高，在监测期间某些物种的变化很大。