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Air quality in Toronto among worst in the world Monday, as Environment Canada issues warning for GTA
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.
Air quality warning for Toronto downgraded, though still among worst in world
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.
Why Toronto residents still aren’t safe from wildfire smoke indoors
Environment Canada urges residents to limit their time outdoors. But even when inside, most buildings can only reduce airborne pollutants by half.
Canada wildfire smoke triggers heat wave and poor air quality warnings in Toronto and the GTA; check who are at risk
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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