Fire Smoke

Family monitoring unhealthy U.S. air quality from Canadian wildfire smoke, with a digital AQI map showing affected states, an air purifier running, and a homeowner replacing an HVAC filter.
Fire Smoke

Canadian Smoke in the U.S.: States Affected

Canadian Smoke in the U.S.: States Affected On July 16, 2026, Minneapolis had the worst air quality of any major city in the world, with parts of the city reaching an AQI of 460. The smoke came from wildfires in northern Ontario and northern Minnesota. For this AirShield HQ® guide to Canadian wildfire smoke air

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