Impact of summer drought on atmospheric pollutant concentrations and its driving factors
Based on the hourly concentrations of PM2.5,PM10,NO2 and SO2(January to August,2022)and the meteorological data in 300 prefecture-level cities in China,the influence of summer drought on air pollutants and the driving factors were studied.The findings revealed significant disparities in the cumulative distribution of PM2.5,PM10,NO2,and SO2 concentrations in the Changsha-Zhuzhou-Xiangtan urban agglomeration between drought and normal periods.The cumulative distribution patterns of pollutant concentrations in the cities within the urban agglomeration remained notably consistent.Summer drought was shown to suppress pollution levels of PM2.5,PM10,NO2,and SO2.Specifically,reductions in NO2 concentrations were observed at 45.27μg/m3(Changsha),48.53μg/m3(Zhuzhou),and 13.40μg/m3(Xiangtan);PM10 at 56.30μg/m3(Changsha),55.68μg/m3(Zhuzhou),and 23.73μg/m3(Xiangtan);PM2.5 at 36.54μg/m3(Changsha),24.48μg/m3(Zhuzhou),and 37.52μg/m3(Xiangtan);and SO2 at 2.19μg/m3(Changsha),18.51μg/m3(Zhuzhou),and 4.35μg/m3(Xiangtan).The study demonstrated that drought could lead to reduced concentrations of PM2.5,PM10,NO2,and SO2 through driving factors such as temperature,atmospheric pressure,wind speed and relative humidity.This research extended the understanding of the impact of drought on air pollution and provided new insights for advancing pollution prevention and control under conditions of extreme weather.
drought eventcumulative distributionaugmented synthetic control methodmediation effect model
万方数据
维普
