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109 Million Americans Choke on Canadian Wildfire Smoke for Second Straight Day
The GuardianยทSaturday, 18 July 2026

Smoke from wildfires in Ontario, Canada drifted across the US midwest, mid-Atlantic, and north-east, affecting 109 million people with poor air quality. Authorities urged people to stay indoors. Health experts compare the air pollution to smoking half a pack of cigarettes a day.
Why It Matters
This is one of the largest air quality emergencies in recent US history, and shows how climate-driven wildfires are becoming a public health catastrophe that crosses borders.
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