[Atmospheric NH3 Emission Inventory and Its Tempo-spatial Changes in Xiamen-Zhangzhou-Quanzhou Region from 2015 to 2020].

Based on the district and county activity level data of different types of atmospheric ammonia (NH₃) emission sources in the Xiamen-Zhangzhou-Quanzhou (XZQ) Region and the modified emission factors, an ammonia emission inventory with a spatial resolution of 1 km×1 km in 2017 was established. In addition, the annual variations in NH₃ emission from 2015 to 2020 in this region were analyzed. The results showed that the emission of NH₃ in the XZQ Region in 2017 was 27.40 kt with livestock and poultry breeding, farmland ecosystem, human emission, fuel combustion, and waste treatment accounting for 42.48%, 22.04%, 14.71%, 7.08%, and 5.69% of the total emission, respectively. The order of emission density of NH₃ was Xiamen (1.94 t·km^-2)>Quanzhou (1.07 t·km^-2)>Zhangzhou (0.95 t·km^-2). High values of emission density were mainly concentrated in the coastal urban areas with a concentrated population and the inland township areas with developed livestock and poultry breeding and planting industries. The monthly variation in NH₃ emissions was consistent with the pattern of temperature change, with high values in summer. Due to the different economic structure and development level in different cities, NH₃ emissions in Quanzhou City showed a decline from 2015 to 2020, whereas there were fluctuations in the trends of ammonia emissions in Xiamen and Zhangzhou cities. The relationship between NH₃ emission intensity and per capita GDP was significantly negative.