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The data of current and annual air quality and emissions inventory at different locations in the Lower Fraser Valley are available to the public on this website.

There are only 4 air monitoring stations in the city of Toronto, serving 2.61 million people and covering an area of about 630 km². Therefore each station serves 6.5 million people and represents 156.5 km².

The data on air quality of downtown Toronto station can be found on the website of Ontario. The average annual air quality is good in downtown Toronto according to the Air Quality Index (AQI) Categories. Summer season however, has more moderate air quality days which attributes to fine particles and ozone. On May 31 2011, the overall air quality is moderate. The air was still good during the early morning, but it became worse during the noon with the fine particulate matter level of PM2.5. Fine particulate matter in Ontario is largely made up of aerosols, elemental and organic carbon and soil. Ozone is a major component of the air pollutants of Toronto. High levels typically occur from May to September, between noon and early evening.

Reference：

(Ontario Ministry of the Environment, 2011) http://www.airqualityontario.com/reports/aqisearch.php?stationid=31103&show_day=0&start_year=2011&submitter=Get+AQI+Readings

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