Composite Pollution Characteristics and Potential Source Area Analysis of PM2.5-O3 in Dalian City
In order to explore the characteristics of PM2.5-O3 composite pollution and analyze the potential source area,ana-lyzing the meteorological characteristics of composite pollution and determines the potential source area by calculating the potential source contribution factor based on the high time resolution PM2.5 and O3-8h online monitoring data and meteorologi-cal factor data of Dalian in 2019.The results show that when the sea level pressure is 1 008.6～1 016 hPa,the temperature is 14.5～21 ℃,and the relative humidity is 48％～59％,the combined pollution of PM2.5-O3 is more likely to occur.The air flow in the northwest and southwest directions has the largest proportion.The PM2.5 concentration in the southwest direction is the highest in spring,autumn and winter,up to 82.55 μg/m3,and the O3 concentration in spring is the highest,is 109.83 μg/m3,while the O3 concentration in the northwest direction is the highest in summer,is 122.02 μg/m3.PM2.5 and O3 pollution in Dalian are affected by long-distance transport in the northeastern part of Shandong Province,the southwestern part of Beijing-Tianjin-Hebei,and the Bohai Sea.The results show that the meteorological conditions for the occurrence of PM2.5-O3 combined pollution are more severe,and the influence of external transport in the northeastern part of Shandong Province and the southwestern part of Beijing-Tianjin-Hebei should be paid attention to in the joint prevention and control of air pol-lution.
NETL
NSTL
万方数据
