ការព្យាករណ៍គុណភាពខ្យល់

Note that the measurements for PM2.5 (fine particulate matter) and PM10 (respirable particulate matter) are taken from the station: Ashburn - Broad Run High School, Northern Virginia and the measurements for SO2 (sulfur dioxide) and CO (carbon monoxide) are taken from the station: Lee District Park - Fairfax County, Northern Virginia







