Why Does Canada’s Largest City Not Meet National Air Quality Standards?


The impacts of precursor reduction and meteorology on ground-level ozone in the Greater Toronto Area (11 page pdf, S. C. Pugliese, J. G. Murphy, J. A. Geddes, J. M. Wang, Atmospheric Chemistry and Physics, Aug. 22, 2014)
Also discussed here: Despite significant reduction in smog-producing toxins, the Greater Toronto Area still violates Canada’s standards for ozone air pollution (Kim Luke, Science Daily, Aug. 22, 2014)
Today we review recent measurements of pollutants included in the Canada Wide Air Quality Standards as they apply to the City of Toronto which has the largest population (of people as well as pollution emitting vehicles) and urban area of all cities in Canada. Resultrs indicate that despite a reduction in emissions of NO2 and PM2.5 of 27 to 50% over the last 4 years, Ozone (O3) exceeded the standards in 2012 at all eight monitoring stations. The authors speculate that this was due to the meteorology of that year which showed a large number of sunny days and light winds which contributed to the production of O3 (from NO2 emissions 63% of which come from from vehicles and O2). They also recommend that volatile organic compounds (VOCs) be included in the standards.

ozone days-toronto

To see Key Quotes and Links to key reports about this post, click HERE

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