ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ UK-AIR, air quality information resource - Defra, UK (uk-air.defra.gov.uk)
Note that the measurements for PM2.5 (fine particulate matter) and PM10 (respirable particulate matter) are taken from the station: Birmingham Tyburn Roadside