Abstract: In order to understand the patterns of heavy ozone (O₃) pollution weather in Jinan, this study analyzed a typical moderate-to-heavy O₃ pollution event from May 31^st to June 5^th, 2022, using air quality data, meteorological observations, and reanalysis datasets to identify the main causes and key influencing factors. The results indicated that during this period, the average daily maximum 8-hour mean O₃ concentration (O₃-8 h) was 218 μg/m³. On June 2^nd, the O₃-8 h concentration was 287 μg/m³, corresponding to severe pollution levels. Ground wind speeds ranged from 0.9 to 2.3 m/s, predominantly from the north, with the relative humidity between 29% and 48%, and daily maximum temperatures consistently exceeding 34 ℃. During the peak pollution episode (June 1^st-2^nd), the vertical velocity (ω) ranged from −0.1 to 0.1 Pa/s, indicating weak subsidence. Observation-base model (OBM) simulations revealed that O₃ formation was VOCs-limited, with alkenes and aromatics as key precursors were, showing relative incremental reactivity (RIP) values of 0.31 and 0.19, respectively. A 20% reduction in these VOCs species could lower daytime (05:00-18:00) O₃ production rates by 6.4% and 4.7%. Airflow trajectory analysis revealed that at the initial stage, most air parcels originated from Anhui and Henan, while as pollution intensified, short-range transport from Linyi via Zibo became dominant. Potential source contribution analysis identified Weifang and Zibo as the main O₃ source regions, while Laiwu District contributed most to the local NO₂ in Jinan. The research found that an upper level ridge combined with a low-level anticyclone created a stable circulation pattern. The persistent weak northerly winds, topological obstruction, and vertical subsidence were key meteorological drivers of the event. O₃ generation was mainly controlled by VOCs, and alkenes and aromatic hydrocarbons were the active species that affected O₃ formation. Under the unfavorable meteorological conditions, it is necessary to pay special attention to the supervision of major VOC emission sources and strengthen joint prevention and control with the surrounding regions to mitigate heavy O₃ pollution events in Jinan.