ការព្យាករណ៍គុណភាពខ្យល់
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ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ Atmo en Hauts-de-France - Pas-de-Calais (atmo-hdf.fr)
Note that the measurements for PM2.5 (fine particulate matter), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station: Calais Berthelot, Nord-Pas-de-Calais and the measurement for CO (carbon monoxide) are taken from the station: drire, Gravelines Pc, Nord-Pas-de-Calais