Based on the activity data collected from various types of agricultural ammonia emission sources, Beijing-Tianjin-Hebei (BTH) region agricultural ammonia emission inventory in 2014 was compiled by using emission factor method. The results showed that the total ammonia emissions from agricultural sources in BTH region were 1750695t in 2014, The average agricultural ammonia emission intensity in the Beijing-Tianjin-Hebei region was 8.09t/km2. Ammonia emissions in Hebei, Beijing and Tianjin were 159408t, 58822t and 97786t respectively. In the livestock and poultry industry, pigs and laying hens were the main sources of ammonia emissions, accounted for 31.29% and 26.07% respectively. The average annual concentration of PM2.5 was decreased 12.04μg/m3 by agricultural ammonia emission reduction of the BTH region, the decline was about 18.36%. In April and July, agricultural ammonia emission reduction had a greater impact on PM2.5, while in January the impact was minimal. The average annual concentration of inorganic salt (sulfate + ammonium salt + nitrate) was decreased 10.00μg/m3 by agricultural ammonia emission reduction, and the decline was about 18.36%. Agricultural ammonia emission reduction had the greatest impact on nitrate, followed by ammonium salt and sulfate minimum.
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