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

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.

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.

Six members of Congress from Wisconsin and Minnesota have asked Canada to say how it plans to tackle the blazes and reduce the haze billowing south.

Toronto and the GTA are under a heat wave and poor air quality warning issued by Environment Canada on July 14, 2025, due to wildfire smoke from northern Ontario. The poor air quality is expected to persist from Monday into Tuesday.

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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.

Toronto Fire Services responded to a call near College and McCaul streets on Saturday evening, where they found heavy fire and smoke at a home.