What Cities From Chicago to Washington, DC, Look Like Under a Blanket of Wildfire Smoke

Wildfire smoke from Canada and Minnesota spread into the U.S. Midwest and Northeast, turning skies orange and triggering air-quality alerts.

Cities including Chicago, Detroit, New York, and Washington, DC recorded some of their worst air-quality levels.

The smoke came from major Canadian and Minnesota fires and was carried by weather patterns such as the jet stream.

The episode underscores how wildfire seasons are worsening and how smoke can threaten public health far from the fire source.