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  • - Ozone pollution (PM2.5): number of days on which a sliding 8-hour average exceeded 120 µg/m3 (micrograms per cubic metre). Average 2021-22-23 for each station - Data sources: ATMO Grand Est, Agence Wallonne de l'Air et du Climat - AWAC, Landesamt für Umwelt- und Arbeitsschutz Saarland - IMMESA, Landesamt für Umwelt Rheinland-Pfalz - ZIMEN, Administration de l'environnement Luxembourg. Harmonization: ATMO Grand Est and GIS-GR 2024