Catalogue of European Surface Ozone Episodes (2003–2022) derived from the CAMS global reanalysis (EAC4). This dataset contains a comprehensive catalogue of 974 regional surface ozone episodes identified across a reduced European domain [10° W–50° E, 34–60° N] during the April–September months of 2003-2022. The identified episodes range in duration from 3 to 30 days. The full description of the file is provided as a README.txt file. The methodology is described by Crespo-Miguel et al. (2024), Science of The Total Environment, 949, 175071. https://doi.org/10.1016/j.scitotenv.2024.175071.