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http://www.ec.gc.ca/air/introduction_e.html
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http://www.messenger.org/messville/smog.html
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http://www.davidsuzuki.org/About_us/Dr_David _Suzuki/Article_Archives/weekly.03296201.asp
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http://www.toronto.cbc.ca/geature/smog/issues.hhtml
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http://www.on.ec.gc.ca/announce.cfm?ID=657&Lang=e
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http://www.toronto.ca/health/smog/healthsmog.htm#a