Toronto has poor air quality right now. How much of a health risk does that pose?

Forest fire smoke in Quebec and northeastern Ontario has wafted its way into Toronto and is affecting the city’s air quality. Toronto usually hovers around three out of 10+ on the Air Quality Health Index scale, which measures the level of pollution in the air. This week, the city reached seven on the scale. CBC's Ali Chiasson explains the risk polluted air poses and what you can do to help mitigate its effects.

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