ការព្យាករណ៍គុណភាពខ្យល់

ចំណាំថាការវាស់វែង PM 2.5 (ភាគល្អិតល្អ) ត្រូវបានយកចេញពីស្ថានីយ៍៖ Hounslow Chiswick and the measurement for PM10 (respirable particulate matter) are taken from the station: UK:Hounslow Gunnersbury and the measurements for O3 (ozone), CO (carbon monoxide) and SO2 (sulfur dioxide) are taken from the station: London N. Kensington







