Spatial-temporal Distribution Of Air Pollutants In Changsha Urban And Suburb

The atmospheric environment is an important environment for human survival.With the development of industry and urbanization,the air pollution is more and more serious.The atmospheric environment of Changsha City which is the core of Greater Changsha Metropolitan Region has been polluted to some extent,so it has important practical significance to study the air pollution of Changsha city.The atmospheric environment of Changsha urban and suburb as the object, the spatial-temporal distribution of air pollutants in Changsha urban and suburb were studied.The main results are as follows:(1)The quality of the atmospheric environment of Changsha urban is worst in winter,but it is best in summer;And the pollution of PM2.5 is the most serious,followed by the pollution of PM10,there are a certain pollution of NO2 in winter, spring and autumn; In addition, the concentrations of PM2.5,PM10,SO2,NO2 and CO were higher in winter and lower in summer,and the concentrations of the pollutants were lower in daytime than at night,while the temporal variation of the concentration of O3 was opposite to the temporal variation of the concentration of PM2.5,PM10,SO2,NO2,CO.The comparative analysis of the temporal variation of the quality of atmospheric environmental and the concentration of air pollutants in Changsha urban and suburb shows that there was no significant change in the quality of atmospheric environment and the concentration of air pollutants in the suburb within one week,but the quality of atmospheric environment and the concentration of air pollutants in urban are obviously changed within one week,and the concentrations of air pollutants in urban of the weekend is less than that of the working day,the quality of atmospheric environment of the weekend is better than that of the working day.(2)The quality of atmospheric environment in Changsha urban improved gradually from the southwest to the northeast;On the whole,the concentration of PM2.5,PM10,SO2,NO2,CO in the Kaifu District is lower,while the concentration of O3 in Kaifu District is higher;And the concentration of PM10,NO2,CO in Furong district is higher,whlie the concentration of O3 in Furong district is lower;And the concentration of O3,PM2.5 and SO2 is higher in Kaifu District.In Changsha suburb,the concentrations of NO2,O3,SO2,CO decreased from east to west,and the quality of atmospheric environment gradually improved from east to west.(3)The analysis of the correlations between the concentration of air pollutants in Changsha urban shows that there are significantly positive linear correlation between the concentration of particulate pollutants,between the concentration of particulate pollutants and NO2,SO2,CO,and between the concentration of CO,SO2,NO2,and also between the concentration of NO2 and SO2 concentration,while there were significant negative linear correlation between the concentration of O3 and CO,NO2.There is a significant linear negative correlation between the concentration of particulate pollutants and O3 in winter,but there is no correlation in other seasons;There is a particularly significant negative linear correlation between the concentration of O3 and SO2 in the summer and winter,but there is no correlation in spring and autumn.In addition, the correlation between the concentration of particulate pollutants is the largest; In terms of the correlation between the concentration of particulate pollutant and gaseous pollutants, the correlation between the concentration of particulate pollutant and NO2 is larger,while there was a minimal between the concentration of particulate pollutant and O3; And in terms of the correlation between the concentration of gaseous pollutants, the correlation between the concentration of NO2 and O3 is the biggest, and followed by the correlation between the concentrations of CO and NO2,while there was a minimal between the concentration of SO2 and O3.