[Inventory and Characteristics of Anthropogenic Ammonia Emission in Xi'an]

Based on the activity data of diverse ammonia sources, the rational estimation method and emission factors were employed, and an anthropogenic ammonia emission inventory was further established to describe the situation of Xi'an in 2013.The results showed that the total anthropogenic ammonia emission reached 47.17×10³ t in 2013 with an emission intensity of 4.57 t·km^-2; The livestock breeding and nitrogen fertilizers were the major sources of anthropogenic ammonia emission, which were 20.55×10³ t and 17.51×10³ t, respectively, accounting for 80.68% in total; Cow and hog were the major sources, and occupied 75.03% in livestock breeding emission; Lintong District was the heaviest emission area, the total emission was 10.73×10³ t, which accounted for 23.22%; The emission intensity of Yanliang District reached 14.75 t·km^-2 which was considered as the most severe area.