Meteorological　conditions　are　vital　to　PM2.5　and　ozone　(O3)　complex　pollution.　Herein,　the　T-mode　principal　component　analysis　method　was　employed　to　objectively　classify　the　925-hPa　geopotential　height　field　of　Dongying　from　2017　to　2022.　Synoptic　patterns　associated　with　four　pollution　types—namely,　Only　PM2.5　pollution,　Only　O3　pollution,　Co-occurring　of　PM2.5　and　O3　pollution,　Non-occurring　of　PM2.5　and　O3　pollution—were　characterized　at　different　time　scales.　The　results　indicated　that　synoptic　classes　conducive　to　Only　PM2.5　pollution　were　“high-pressure　top　front”,　“offshore　high-pressure　rear”,　and　“high-pressure　inside”,　while　those　conducive　to　Only　O3　pollution　were　“offshore　high-pressure　rear”,　“subtropical　high”,　and　“high　and　low　systems”.　The　Co-occurring　of　PM2.5　and　O3　pollution　were　influenced　by　high　pressure,　and　the　Non-occurring　of　PM2.5　and　O3　pollution　were　linked　to　precipitation　and　strong　northerly　winds.　The　variation　in　dominant　synoptic　patterns　is　crucial　in　the　frequency　changes　of　the　four　pollution　types,　which　was　further　validated　through　the　analysis　of　typical　cases.　Under　the　favorable　meteorological　conditions　of　high-pressure　control　with　strong　northerly　winds　or　a　subtropical　high　and　inverted　trough　both　with　strong　precipitation,　there　is　potential　to　achieve　coordinated　control　of　PM2.5　and　O3　in　Dongying.　Additionally,　measures　like　artificially　manipulating　local　humidity　could　be　adopted　to　alleviate　pollution　levels.　This　study　reveals　the　importance　of　comprehending　the　meteorological　factors　contributing　to　the　formation　of　PM2.5　and　O3　complex　pollution　for　the　improvement　of　urban　air　quality　in　the　Bohai　Rim　region　of　China　when　emissions　are　high　and　the　concentration　of　air　pollutants　exhibits　high　meteorological　sensitivity.　摘要　本文研究了中国环渤海地区典型石化城市东营市近年来PM2.5与臭氧复合污染的天气形势特征.　结果表明,　有利于促发PM2.5单独污染的环流形势与高压顶前部型,　海上高压后部型,　高压内部型有关;　有利于促发臭氧单独污染的天气型与海上高压后部,　副高和高低值系统有关;　PM2.5和臭氧双高污染的发生主要受高压系统的控制;　不利于PM2.5和臭氧污染发生的环流类型则与降水和较强的偏北风有关.　优势天气型的变化是导致四种污染类型发生频率变化的重要因素.　研究结果揭示了当一次排放处于高位,　且空气污染物浓度变化具有高气象敏感性的情况下,　弄清PM2.5和臭氧复合污染的气象成因对于中国环渤海地区城市空气质量持续改善的重要意义.　©　2024