ការព្យាករណ៍គុណភាពខ្យល់

ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ the Air Quality in Wales (airquality.gov.wales)
Note that the measurements for PM2.5 (fine particulate matter) and O3 (ozone) are taken from the station: Rhondda Glyncoch Garth Avenue and the measurement for NO2 (nitrogen dioxide) are taken from the station: UK:Wales/Nantgarw Road