Aerosol and Inversion Layer Characteristics of a Polluted Weather in Jinan Area

To explore the characteristics of winter air pollution in Jinan, the hour-by-hour aerosol, upper air, and ERA5 meteorological data in Jinan were used to analyze the change patterns and characteristics of atmospheric pollutants PM2.5, PM10, CO, NO2, SO2, and O3 during a very long period of polluted weather in Jinan from January 10–28, 2021, and the air quality sub-index was used to calculate the primary atmospheric pollutants of this pollution, the Lagrangian trajectory model was used to explore the potential sources of this pollutant, and the characteristics of the inversion layer were analyzed, the results showed that: the change trend of AQI of pollution process is basically consistent with PM2.5, PM10, NO2, indicating that PM and NO2 are the main pollutants causing winter pollution in Jinan area, while CO, SO2 and O3 are not the main pollutants, PM and O3 show an obvious staggered trend; winter pollution in Jinan is mainly influenced by sand and dust from the northwest and local pollution emissions, entering winter, controlled by Siberian high pressure, winter airflow trajectory direction is mainly northwest, moving fast, bringing a lot of sand and dust to East China, continuous coal-fired emissions result in increasing PM2.5 concentration in the atmosphere, causing winter pollution; close to the ground inversion and off-ground inversion, together with the special topography of Jinan, which is high on all sides and low in the middle, all have an impact on the formation of pollution.