2019-2023年聊城市PM2.5和O3质量浓度变化特征的相关性分析及气象因素影响研究OA

To investigate the characteristics of atmospheric composite pollution and meteorological driving mechanisms in medium-sized industrial cities,this study systematically analyzed the spatiotemporal variations and synergistic effects of PM2.5 and ozone(O3)based on air quality data from five national stations and eight county-level monitoring stations in Liaocheng City from 2019 to 2023.The results showed that the annual average PM2.5 concentration exhibited a fluctuating downward trend but rebounded in 2023 with increased extreme values.O3 concentrations displayed a"decline followed by rise"pattern,peaking at 230.0 μg/m3 in June during the summer pollution season.Correlation analysis revealed that PM2.5 and O3 pollution showed a positive correlation in summer and a negative correlation in winter,Among various meteorological factors,temperature exhibited a significant positive effect on O3 formation.When humidity was in the 60％-70％range,the risk of simultaneous PM2.5 and O3 exceedance increased.Wind analysis further showed that O3 exceedances predominantly occurred under the presence of southerly winds(0 to 7.5 m/s),displaying a distinct"red tongue"extension pattern,while calm and westerly winds exacerbated PM2.5 concentration.