Study on Evolution Characteristics and Meteorological Influencing Factors of PM2.5 in Yibin City
In recent years,Yibin city has been vigorously promoting its construction as the economic sub center of Sichuan province.However,there is a certain contradiction between development and environmental protection,and atmospheric fine particulate matter(PM2.5)pollution has become an important factor hindering urban development.Using PM2.5 observation data and meteorological data from Yibin city for five consecutive years from 2016 to 2020,the temporal variation characteristics of PM2.5 in Yibin city and the impact of various meteorological factors on PM2.5 in Yibin city are analyzed.The results show that the seasonal variation of PM2.5 mass concentration in Yibin city show a"U"shape,and the interannual variation show a fluctuating downward trend.Although there is a significant improvement in air quality,it still does not meet the second level standard of the Ambient Air Quality Standard(GB 3095-2012);There is a negative correlation between precipitation,wind speed,and PM2.5 mass concentration;The precipitation process is the main removal mechanism of PM2.5 from late spring to early autumn,which significantly reduces the PM2.5 mass concentration of the second day.rainstorm and long continuous light rain can effectively wash the PM2.5 in the atmosphere;Temperature has a certain impact on the concentration of PM2.5,but seasonal weather activities play a major role;The diffusion effect of winter monsoon plays an important role in reducing PM2.5 pollution,and the washing effect of summer precipitation on PM2.5 is greater than the diffusion effect of wind;In high relative humidity environments,precipitation has a greater sedimentation effect on PM2.5 than its hygroscopic effect on PM2.5.The research results can provide scientific basis for air pollution prevention and ecological civilization construction in Yibin city,and have certain indicative significance for air quality forecasting of PM2.5 pollution.
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