ការព្យាករណ៍គុណភាពខ្យល់
ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ Atmo en Hauts-de-France - Pas-de-Calais (atmo-hdf.fr)
Note that the measurements for O3 (ozone), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station: Calais Parmentier, Nord-Pas-de-Calais and the measurement for CO (carbon monoxide) are taken from the station: drire, Gravelines Pc, Nord-Pas-de-Calais