Research on the characteristics and interaction of PM2.5 and O3 composite pollution in Shenyang region using the 2O19 pollutant concentration observation data from 11 environmental air quality monitoring sites and 3 VOCs(Volatile Organic Compound)Monitoring Sites in Shenyang Region,the spatiotemporal variation characteristics of conventional pollutants such as PM2.5 and VOCs were studied.Statistical analysis was conducted on the long-term synergistic growth trend of PM2.5 and O3 in Shenyang region from 2015 to 2020.The results showed that all types of pollutants in the Shenyang area show a single cycle peak valley distribution,among which primary pollutants such as NO,NO2,CO,NOx(NO+NO2),TVOCs(total concentration of VOCs),and PM2.5 are higher in the cold season(autumn and winter)and lower in the warm season(spring and summer),while secondary pollutants O3 and Ox(O3+NO2)are the opposite.The concentrations of O3 and Ox are low at night,gradually increasing in the morning and reaching their peak in the afternoon.The concentration of pollutants decreases in the afternoon,gradually increases in the evening,and reaches its peak in the morning.The concentration of O3 is higher in the downwind direction towards the suburbs and lower in the hustling areas.The concentrations of PM2.5,NO,NO2,CO,and VOCs are generally high in bustling areas and industrial areas,and low in the downwind direction towards the suburbs.For different categories of VOCs,alkanes have the highest concentration,followed by alkynes,olefins,and aromatics.The synergistic growth phenomenon of PM25 and O3 in Shenyang region from 2015 to 2020 was most evident in summer,and showed an increasing trend of fluctuations.The synergistic growth in summer and the interannual variation trend of O3 concentration have good consistency,both reaching their peak in 2017 and slightly decreasing before gradually recovering thereafter.
万方数据
