TORONTO - The poor air quality that has blanketed swaths of central and Western Canada is not only infiltrating the lungs, but also distressing the mind.

Parts of the Greater Toronto Area (GTA) are under an air quality warning on Monday alongside an ongoing heat warning in the region, Environment Canada says.

Environment Canada is warning of poor air quality and extreme heat in Toronto on Monday as southern Ontario braces for a week filled with hot and humid weather.

Environment Canada urges residents to limit their time outdoors. But even when inside, most buildings can only reduce airborne pollutants by half.

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The City of Toronto is providing free portable air conditioners to low-income, vulnerable seniors as part of a pilot program that started this spring.

Expect deteriorating air quality across parts of Ontario heading into the new workweek as upper-level winds blow wildfire smoke into the region. Some of the smoke could mix down to the surface, lowering air quality from northern Ontario to the Greater Toronto Area.

Due to air quality concerns, the game between the Calgary Stampeders and the Saskatchewan Roughriders on July 11 has been postponed to Saturday, July 12.