While Toronto hasn't experienced skies as smoky as Vancouver's, there is a visible grey haze over Lake Ontario and the other Great Lakes.
Satellite imagery from NASA shows a haze settling over much of southern Ontario.
CBC meteorologist Jay Scotland said most of the particulate matter, however, is high above the city.
"The upper level winds are carrying much of that particulate matter north of us," Scotland said.
Toronto has experienced several days of hot, muggy weather that's set to be snapped Tuesday as a cold front rolls in. There's a risk of an afternoon thunderstorm this afternoon that could cause heavy downpours at some points.