The Air Quality Health Index is expected to be as high as seven, or high risk, according to Environment Canada.

Toronto was the second worst in a global ranking on Monday. The city had the second-worst air quality in the world as of Monday morning, according to IQAir, a free, real-time air quality monitoring ...

Air quality warnings in effect for the Greater Toronto Area, as wildfire smoke from northern Ontario impacts much of the province. The poor air quality may persist for the next several days for some a ...