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Данные о качестве воздуха предоставлены: Atmo en Hauts-de-France - Pas-de-Calais (atmo-hdf.fr)
Note that the measurements for PM2.5 (fine particulate matter), PM10 (respirable particulate matter), O3 (ozone), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station: Valenciennes Acacias, Nord-Pas-de-Calais