ຂໍ້ມູນຄຸນນະພາບອາກາດສະໜອງໃຫ້ໂດຍ: Atmo en Hauts-de-France - Pas-de-Calais (atmo-hdf.fr)
Note that the measurements for O3 (ozone), NO2 (nitrogen dioxide), SO2 (sulfur dioxide) and CO (carbon monoxide) are taken from the station: Roubaix Serres, Nord-Pas-de-Calais