Analysis Of Characteristics And Source Analysis Of Particulate Matter Pollution In Weinan In Autumn And Winter From 2018 To 2019

Weinan is located in Shaanxi Province,and is one of the important cities in the Fen-wei Plains.It is also a key city in the Battle of the blue sky.Through previous studies,it is found that most of the polluted weather in Weinan belongs to fine particulate matter pollution,that is,PM2.5 pollution.Therefore,it is particularly important to study the overall situation of PM2.5 pollution in Weinan and analyze its main sources for designating pollution control measures in the region.this research analyzes the online monitoring data of atmospheric fine particulate matter(PM2.5)in Weinan,combining meteorological conditions and conventional pollutants,we will conduct chemical component analysis,source analysis,regional transmission effects and potential pollution source distribution in Weinan over Observation period,and analyze the characteristics and changes of air pollution in Weinan since the observation period.The research mainly draws the following conclusions.Like most cities,the PM2.5 concentration in Weinan also presents a seasonal distribution.The PM2.5 concentration is high in summer and autumn,and low in winter and spring.In 2019,summer pollution has been reduced compared with 2018,the pollution in winter is more significant than in 2018,with PM2.5 as the main characteristic pollutant.The pollutant concentration index is extremely poor,and the pollutant concentration is abnormally high when the weather is heavily polluted.In the analysis of chemical composition and characteristics,SNAaccounted for the highest concentration of PM2.5.During the observation period,the reaction of the conversion of gaseous pollutants to water-soluble inorganic ions was obvious,which caused the PM2.5 concentration to rise.The source analysis results show that there are five types of sources that have a greater contribution to the PM2.5 mass concentration in Weinan during the observation period,of which secondary sources account for the largest proportion of the PM2.5 mass concentration.The preliminary results of the simulation analysis on the influence of regional transmission in Weinan show that Weinan is mainly affected by short-distance transmission within the province and surrounding provinces and cities,and potential pollution sources are mainly located in Xi’an,Xianyang,Tongchuan and other places.Under different air quality levels,in the PM2.5 chemical components,the correlation between organic carbon and elemental carbon is relatively significant.As the pollution level increases,the sulfur oxidation rate and nitrogen oxidation rate both increase correspondingly.The heavy pollution process has slow accumulation,long duration,and fast removal.Common features.With the increase of pollution level,the contribution of secondary pollution sources(secondary conversion of gaseous pollutants)to PM2.5 concentration increased,the contribution of motor vehicle exhaust emissions decreased to a certain extent,and the contribution of industrial sources and biomass combustion sources did not change significantly.