ការព្យាករណ៍គុណភាពខ្យល់
ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ UK-AIR, air quality information resource - Defra, UK (uk-air.defra.gov.uk)
Note that the measurements for O3 (ozone), CO (carbon monoxide) and SO2 (sulfur dioxide) are taken from the station: London N. Kensington