“Eight of the top 10 least polluted cities are Canadian, the United Nations agency said in its study of outdoor air contamination levels across 91 countries.”
"Agency officials compiled self-reported data on the number of microscopic airborne particles in some 1,100 cities around the world between 2003 and 2010.
The Yukon capital of Whitehorse topped the list of cities at 2.9 micrograms per cubic metre, the WHO said, with the British Columbia towns of Kitimat and Burns Lake rounding out the top three at 4.0 and 4.8 micrograms, respectively.
Five other Canadian cities made the top 10: the B.C. communities of Nanaimo, Terrace and Nelson, along with Corner Brook, N.L., and Fredericton, all boast air pollution levels below 6.5."