Wildfires in central Canada and northern Minnesota have led to significant smoke haze affecting major metropolitan areas across the Midwest, Northeast, and mid-Atlantic regions. Over 100 million people received air quality alerts as a result. In Washington, D.C., air quality reached a Code Purple level on July 17, 2026, causing visibility issues at key landmarks. Mayor Muriel Bowser advised sensitive groups to stay indoors and recommended that others limit outdoor activities and wear masks if necessary. All outdoor activities organized by the D.C. government were canceled, and outdoor pools and spray parks were closed.
Michigan reported its highest air pollution levels since monitoring began in the early 2000s, prompting Detroit to cancel all city-run outdoor activities. Earlier in the week, New York experienced unhealthy air quality levels, which improved by July 17. Skies in New England also showed a yellow hue due to the smoke, but conditions cleared significantly by that date.