Spatial And Temporal Distribution Of Ammonia Emission And PM_2.5 In Handan City

In recent years,with the continuous innovation of production technology,China’s agriculture has developed rapidly.However,under the production mode of high input and high output,the rapid development brings about increasingly serious resource and environmental problems.A series of agricultural activities based on livestock and poultry breeding and farmland fertilization have become the main sources of atmospheric ammonia emissions.Ammonia is an important prerequisite for the formation of PM_2.5 in the atmosphere,which has an important impact on the formation of haze.Therefore,it is of great significance to scientifically analyze and put forward control measures for the control of PM_2.5 pollution.Based on this,this study selected Handan City,a typical agricultural area in North China Plain,as the research object,constructed the estimation index system of ammonia emission in Handan City in 2016,established the ammonia emission inventory of Handan City in 2016 by the emission factor method,clarified the influence of NH₃emission on air pollution and its spatial and temporal distribution characteristics,and measured atmospheric NH₃ in winter in Handan city by passive sampling method in order to find out the correlation between atmospheric ammonia emission and PM_2.5concentration,the temporal and spatial distribution characteristics of atmospheric NH₃concentration in Handan City in recent years were analyzed.The main results of this study are as follows:（1）the total NH₃ emission of Handan City in 2016 was 52.62kt,and it was found that the contribution rate of different agricultural sources to atmospheric ammonia emission was as follows:livestock and poultry breeding>nitrogen fertilizer application>population>soil background>nitrogen fixing plants;in livestock and poultry breeding industry,different types of ammonia emissions are as follows The contribution rate of aquaculture to atmospheric ammonia emission was as follows:pig>poultry>cattle>sheep>donkey>horse;（2）It is clear that the NH₃ emission in winter in Handan is higher than that in summer.The average concentration of NH₃ is 28.1μg/m³.There is no significant spatial difference between urban and rural monitoring points.The concentration of NH₃in Handan is higher than that in most cities and rural areas at home and abroad.（3）The spatial and temporal distribution characteristics of NH₃ emission in Handan city from2015 to 2019 were revealed.From the inter annual perspective,the annual average concentration and deposition showed a significant upward trend,and the annual increase was 18.23%and 15.02%;from the four seasons of the year,the variation of atmospheric NH₃ concentration and NH₃ deposition in Handan city was as follows:spring>summer>winter>autumn,but the seasonal variation difference was not significant.（4）When the temperature is low in winter,the change of PM_2.5 concentration and the change of atmospheric NH₃ concentration have a significant delayed response relationship;when the temperature is high in winter,the change of PM_2.5 concentration of particulate matter has synchronous correlation with the change of atmospheric NH₃concentration,and has significant characteristics.（5）Handan City,as one of the central representatives of the typical agricultural area in North China Plain,can carry out NH₃emission reduction measures from two aspects of livestock and poultry breeding industry lean reform and scientific use of agricultural nitrogen fertilizer,so as to improve the current situation of PM_2.5 pollution in the region and gradually realize the sustainable development of China’s economy.