Distribution Characteristics of Ammonia Emission from Livestock Farming Industry in Beijing
Ammonia is an important precursor to form fine particulates(PM2.5). Average foreign emission factor as the emission factor,distribution characteristics of ammonia emission from livestock farming industry in Beijing was studied. In 2012,44.3 thousand tons of ammonia was produced form livestock farming industry in Beijing. Maximum emission was in Shunyi District,accounting for 20.4% of total emission. Only a small amount of cow was farmed in Chaoyang District,and less livestock were farmed in Haidian District,and Mentougou District was ecological conservation in Beijing,and few ammonia were emitted in the there districts. The maximum emission intensity,8.9t/km2,was in Shunyi District,followed by Daxing District,Pinggu and Miyun County,while less emission intensities were in Chaoyang District,Mentougou District,Fengtai District and Haidian District. The average ammonia emission intensity in Beijing was 2.70t/km2. Most ammonia was emitted from broiler breeding,up to 37.8% of total emission,followed by the pig industry,accounting for 37.3%. The results could provide a scientific basis for ammonia and air pollution control,especially haze treatment,in Beijing.