ការព្យាករណ៍គុណភាពខ្យល់

ទិន្នន័យគុណភាពខ្យល់ផ្តល់ដោយ៖ the Nova Scotia Environment (novascotia.ca)
Note that the measurements for O3 (ozone), CO (carbon monoxide), NO2 (nitrogen dioxide) and SO2 (sulfur dioxide) are taken from the station: CA:Nova Scotia/Halifax Johnston Gases