Air Quality Analysis And Pollution Source Analysis Of A Typical Region In Shenyang

Air pollution is widely concerned by today's society.The degree of atmospheric pollution can affect human health and limit human development in many ways.In recent years,air pollution in our country,especially in the north,is more serious,and there are more haze weathers.Therefore,it is particularly important to study atmospheric pollutants and analyze their sources.This paper selects a typical regional atmosphere in Shenyang as the research object,analyzes the PM2.5 pollution characteristics and chemical composition,analyzes the air quality of the region and analyzes the main pollution contribution source of PM2.5 in this region according to PMF5.0 software.,draw the following conclusions:During the sampling period,the maximum mass concentration of PM2.5 in this area occurred in winter(2016.12.20),and the PM2.5 in each season was sorted according to the degree of pollution: winter(109.54?g/m3)> spring(76.77?g/m3).>Autumn(57.63 ?g/m3)>Summer(34.90 ?g/m3).Among them,the daily average concentration of PM2.5 in winter is 1.46 times of the national air quality secondary standard limit(75?g/m3),and the daily average concentration of PM2.5 in spring is also greater than 75?g/m3.Therefore,it can be seen that the pollution problem of PM2.5 in the atmosphere in this area is quite serious,and the pollution situation in winter is particularly prominent.During the sampling period(September 2016 to July 2017),the average concentration of PAHs in this typical area of Shenyang is 50.1 ng/m3,among the number of pollutants detected,among which Benzo(b)Fluoranthene(BbFA)The concentration was the highest,reaching 8.9 ng/m3,followed by Fluoranthene(FA)at a concentration of 5.8 ng/m3.The concentrations of Terpenes(AC)and hydrazine(ACL)were the lowest at 0.1 ng/m3.The pollution of PAHs in Shenyang is more serious,but it is at a lower level compared with heavily polluted cities such as Beijing and Xi'an.According to the seasonal pollution characteristics(heating period,non-heating period)of PAHs,we conclude that the PAHs concentration during heating period is significantly higher than other time periods,which is 152.2 ng/m3,which is three times the annual average concentration.In each period,benzo(b)fluoranthene(BbFA)is the component with the highest contribution rate,and it reaches the maximum contribution rate in summer,which is 33%.The contribution rate of other components in the heating period increases,resulting in its contribution rate.Declined.According to the calculation of PMF5.0 software,the six pollution sources with the highest concentration of PM2.5 in the typical area of Shenyang are coal combustion source(29%),transportation source(17.3%),and metal manufacturing source(11.6%).),soil dust(7.4%),secondary source(30.1%),biomass burning source(4.5%).Combustion and secondary sources are the most likely major sources of pollution in Shenyang.The contribution rate of biomass burning in autumn is high,and the large amount of straw produced by large-scale farming land may be the main cause of this phenomenon.