Ontario Wildfire Smoke Creates World's Worst Air Quality in Toronto
Thick wildfire smoke from Northwestern Ontario drifted south, blanketing Toronto with hazardous air conditions and making the city the worst in the world for air quality on July 15–16, forcing residents indoors and triggering hospital visits.
By July 15, there were over 180 active wildfires across Ontario, with 136 burning in Northwest Ontario alone. On July 15, wildfire smoke began drifting over southwestern Ontario, rendering Toronto's air quality the worst in the world and covering the area with a smoky orange haze. The city was put under an orange alert, meaning severe weather is likely to cause damage, disruption or health impacts.
The emergency departments at Toronto General Hospital and Toronto Western Hospital received 36 visits from patients experiencing issues related to poor air quality, including shortness of breath, allergic reaction, chest pain, cough/congestion, and eye pain on July 15. By July 16, the air quality in Toronto was about five times worse than it was on the previous day, with the orange alert still in effect.
Impact Across Ontario
- Several youths were treated at a camp in Muskoka Lakes for air quality-related issues.
- Smoke also drifted across provincial borders, affecting air quality in Quebec and parts of the U.S. Midwest and Northeast
- Members of the US Republican Party blamed Canada for the smoke spreading across the northern United States, accusing them of poor forest management. On July 17, 2026, president Donald Trump on Truth Social threatened to levy additional tariffs on Canada and plans to call Prime Minister Carney over the matter.
While air quality was expected to improve gradually by late July, the crisis highlighted the growing interconnection between Canada's wildfire season and air quality impacts across North America. Vulnerable populations—including those with respiratory conditions, children, elderly people, and pregnant women—faced elevated health risks.
If you are new to Canada or a temporary resident, be aware that wildfire smoke events can occur suddenly during summer months, especially in Ontario and Western Canada. Stock up on N95/KN95 masks before fire season, keep air purifiers on hand, and monitor Environment Canada's air quality health index regularly. Stay indoors during orange or red alert days, and consider purchasing a HEPA filter for your home.
Sources
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