Two inventories of NH3 emissions of the Yangtze River Delta (YRD) region in eastern China were developed for 2014 based on the constant emission factors (E1) and those characterizing the agricultural processes (E2), respectively. The total emissions were calculated at 1765 and 1067 Gg, respectively, and agricultural activities (livestock farming and fertilizer use) were estimated to contribute 74-84% to total emissions in the two inventories.It proved that agricultural process could optimize the spatial distribution of NH3 columns and the correction effect for emission factors by pH was more reasonable in the alkaline soil in this study. Major part of YRD were identified as NH3-rich throughout the entire year except southwestern Zhejiang. Our finding also suggested that NO3- would increase if no control measures were taken for NH3 emissions, resulting in reduced benefits of air quality improvement through SO2 and NOx emission abatement.
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The GR values in the YRD region simulated with the two inventories by month