摘要
Based on the monitoring data of PM2.5 mass concentration at four national environmental monitoring stations in Anqing City from 2015 to 2018,the monthly and daily variation characteristics of PM2.5 mass concentration in Anqing were studied.Besides,the relationship between PM2.5 mass concentration and meteorological conditions was analyzed based on the meteorological data of Anqing station in the same period.The results showed that the mass concentration of PM2.5 in Anqing City was high in winter and low in summer,and the diurnal variation curve had two peaks and one valley.Precipitation had a significant effect on the removal of PM2.5,and the relationship between wind speed and PM2.5 mass concentration was more complicated.When the hourly average wind speed was force 1,the mass concentration of PM2.5 was the highest.In winter,the greater the wind speed was,the higher the mass concentration of PM2.5 was.As horizontal visibility was 1-4 km,the mass concentration of PM2.5 was the highest.Under the influence of water mist,it dropped significantly when visibility was less than 1 km.
Based on the monitoring data of PM2.5 mass concentration at four national environmental monitoring stations in Anqing City from 2015 to 2018,the monthly and daily variation characteristics of PM2.5 mass concentration in Anqing were studied. Besides,the relationship between PM2.5 mass concentration and meteorological conditions was analyzed based on the meteorological data of Anqing station in the same period. The results showed that the mass concentration of PM2.5 in Anqing City was high in winter and low in summer,and the diurnal variation curve had two peaks and one valley. Precipitation had a significant effect on the removal of PM2.5,and the relationship between wind speed and PM2.5 mass concentration was more complicated. When the hourly average wind speed was force 1,the mass concentration of PM2.5 was the highest. In winter,the greater the wind speed was,the higher the mass concentration of PM2.5 was. As horizontal visibility was 1-4 km,the mass concentration of PM2.5 was the highest. Under the influence of water mist,it dropped significantly when visibility was less than 1 km.
