<p>This study examines the spatio-temporal dynamics of surface ozone (O₃) pollution and the critical role of meteorological conditions in shaping its distribution across a major coastal province in eastern China. Based on high-resolution observational data from 2019 to 2023, we identify distinct spatial gradients and seasonal patterns in O₃ concentrations, with pronounced differences between urban and coastal zones. O₃ pollution frequency peaks at approximately 60% in June, with concentrations reaching ~ 200&#xa0;µg m⁻³. Although pollution levels generally decline after July, elevated O₃ persists into September, particularly in urban areas south of the Yangtze River. Meteorological drivers exhibit strong regional heterogeneity: near-surface temperature dominates O₃ variability in inland urban areas, whereas solar radiation and wind fields become increasingly influential in coastal and industrialized regions. Crucially, we demonstrate that meteorological variations not only modulate daily pollution intensity but also extend the duration of high-O₃ episodes. This dual modulation effect contributes directly to the prolongation of the ozone season and the amplification of spatial disparities across the region. Our findings highlight the pivotal role of meteorology in exacerbating O₃ pollution in rapidly urbanizing coastal zones. These results are representative of many industrialized coastal cities in East Asia, where the convergence of urbanization, emissions, and complex coastal meteorology shapes evolving air quality challenges. The insights provided are essential for developing region-specific strategies to manage seasonal ozone risks under a changing climate.</p>