ការព្យាករណ៍គុណភាពខ្យល់

ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ the Colorado Department of Environmental Protection (colorado.gov)
Note that the measurements for O3 (ozone), CO (carbon monoxide) and SO2 (sulfur dioxide) are taken from the station: USA:Colorado/Highway 24