Characteristics and Traceability Analysis of One Environmental Air Ozone Pollution Process in Shenyang City

Using the environmental air quality monitoring data and meteorological data of Shenyang City from June 14th to 19th, 2023, spatial distribution, time series curve, correlation analysis, backward trajectory and other methods were used to analyze the characteristics, meteorological factor correlation, weather situation and external input contribution of this environmental air ozone pollution. The results showed that this pollution process was regional pollution, with a maximum 8-hour moving average of 214 μg/m³ of ozone on June 17th, and mild pollution, with the highest hourly concentration of ozone reaching 226 μg/m³; When Shenyang city was affected by weather systems such as high-pressure rear, low-pressure front, low-pressure trough, and high-pressure, ozone pollution was prone to occur. Ozone concentration would be influenced by meteorological factors such as wind direction, wind speed, temperature, and relative humidity, and was negatively correlated with wind speed and relative humidity, and positively correlated with temperature. The air masses originating from the southwestern periphery of Shenyang account for 45.83% of the total air masses in the Shenyang area. The weighted potential source contribution factor（WPSCF） from Shenyang and the southwest direction was greater than 0.5, and the weighted concentration weighted trajectory value（WCWT） was greater than 90.0, which were the main source contributions of ozone pollution processes.