Smoke from Canadian wildfires, part of the country's second-worst wildfire season on record, has drifted into the northeastern and midwestern United States, triggering air quality alerts from Minnesota to Maine. The wildfires have burned approximately 7.4 million hectares as of August 11, 2025. This persistent smoke has caused unhealthy air quality levels in states including Minnesota, Wisconsin, and parts of the Twin Cities, with advisories issued for northern and west central Wisconsin. Additionally, wildfire smoke from other sources, such as the Gifford Fire in Central California and fires in Gila County, Arizona, has contributed to degraded air quality in the Bay Area and central Arizona. Republican lawmakers have called on Canada to take measures to lessen the impact of the wildfire smoke on air quality in both countries. The widespread smoke has raised health concerns across North America, affecting major urban centers from Chicago to New York and beyond.