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