Characteristic and Component Differences of Heavy Pollution Process of Different Types of Particulate in Xuzhou City
After years of air pollution prevention and control,China·s air quality had been greatly improved,but heavy pollution process still occurs.The process of heavy pollution of three different types of particulate matter in Xuzhou from 2018 to 2021 was analyzed from pollution characteristics,evolution trend,characteristics and correlation of PM2.5 components and pollution causes.The results showed that,in the process of different types of heavy pollution,the proportion of secondary inorganic ions NO-3,SO2-4,NH+4 in PM2.5 was still the highest.During the cumulative heavy pollution period,NO-3,SO2-4,NH+4 increased by 144%,142%and 183%respectively,and secondary inorganic ions contributed greatly to the growth of PM2.5.Combining correlation analysis and SOR and NOR values,it was found that the secondary generation of nitrate and sulfate was significant.During the period of heavy dust pollution,based on the radar monitoring results and the backward trajectory map,it could be seen that the sedimentation of sand and dust at high altitude and the superposition of pollutants near the ground caused high values of particulate matte.The concentration of Ca2+ and Mg2+ in chemical components had the greatest impact on the concentration of PM2.5,and the secondary generation and transformation had little impact on it.During the heavy pollution period of fireworks discharge,the K+,Mg2+ and Cl-ions which have a greater relationship with fireworks increased by 1 112%,2 058%and 239%respectively compared with those before the pollution,which had a significant increase in the influence on the pollution process.
heavy pollutionchemical compositioncorrelation analysisbackward trajectory
NETL
NSTL
万方数据
