标题：Changes and drivers of ozone suppression in warm seasons in China’s six major urban agglomerations over the past decade

作者：Xiaoyong Liu, Jun Yan, Fangcheng Su, Xiaofang Pan, Wei Wei, Hui Gao

来源出版物：Air Quality, Atmosphere & Health

DOI：10.1007/S11869-026-01888-8

出版年：2026

文献类型：Article

语种：英文

摘要：Tropospheric ozone (O₃) remains a critical air quality challenge in China despite effective reductions in PM_2.5 levels. This study investigates the phenomenon of Ozone Suppression (OS) under high-temperature conditions across six major urban agglomerations in China—Beijing-Tianjin-Hebei (BTH), Yangtze River Delta (YRD), Pearl River Delta (PRD), Cheng-Yu (CY), Middle Yangtze River Delta (MYR), and Middle Plain (MP)—from 2015 to 2024. Using a Z-test, we identified the cutoff temperature (T_c) for OS events and analyzed its spatiotemporal variability. Results revealed significant regional differences, with T_c ranging from 28.0 °C to 35.3 °C, higher in plains and lower in coastal and plateau regions. An XGBoost model was developed to predict daily maximum 8-hour O₃ (O₃-8 h) under OS, demonstrating strong performance (CV-R²: 0.69–0.85, CV-RMSE: 18.12–23.37 µg·m⁻³). SHAP analysis quantified the relative contributions of meteorological, anthropogenic, and natural factors. Key drivers included PM_2.5, 2-m temperature (t2m), and meridional wind (v10), with pronounced regional heterogeneity: PM_2.5 dominated in MYR, PRD, and YRD, while t2m, surface solar downwards (ssrd), and 2-m dew point (d2m) were primary in BTH, CY, and MP, respectively. Meteorological factors contributed 39.0%–66.2% to O₃-8 h variations. These findings underscore the need for region-specific ozone control strategies tailored to localized drivers under warming climate conditions.

关键词：Ozone pollution; High temperature; Ozone suppression; Driving force; China

影响因子：3.1

论文链接：https://doi.org/10.1007/S11869-026-01888-8

（地理科学学院 刘媛心/撰稿 崔向超/初审 闫军辉/复审 韩勇/终审）