वायु गुणवत्ता पूर्वानुमान
वायु गुणवत्ता डेटा प्रदानकर्ता: 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