Heavy smoke from hundreds of wildfires in Canada has drifted into the United States, prompting air quality warnings across several states. As of July 17, 2026, the smoke has affected regions from the Great Lakes to parts of the East Coast, with officials urging residents to stay indoors and limit outdoor activities.
The National Weather Service has issued air quality alerts for areas including Michigan, Ohio, Pennsylvania, and New York. The smoke, originating from wildfires in British Columbia and Alberta, has led to hazy skies and reduced visibility. Health officials recommend wearing N95 masks if going outside is unavoidable.
In Canada, the wildfires have burned over 10 million hectares this season, according to the Canadian Interagency Forest Fire Centre. The smoke has also impacted air quality in major cities like Toronto and Ottawa, with Environment Canada issuing similar warnings.
Meteorologists expect the smoke to persist for several days, depending on wind patterns. Vulnerable populations, including children, the elderly, and those with respiratory conditions, are advised to take extra precautions.
