Massive plumes of Canadian wildfire smoke are set to pour over the border into the United States, bringing dangerous air quality to more than 100 million people in the Midwest and Northeast.
Smoke has already been an issue this summer in parts of the West, Plains and Midwest as stateside fires have burned more than 3.6 million acres, mostly in the western half of the country. But the thicker smoke, forecast to move over New York, Washington, DC and other cities in the East, is from wildfires to the north.
Check out the smoke forecast in the CNN Weather app
In Canada, more than 3,000 fires have burned nearly 4.5 million acres this summer, with a dozen blazes flaring up in Ontario in recent weeks, filling the skies with smoke that is starting to drift south, like it did in an extreme way in 2023.
Canadian wildfire activity this year is nowhere near the hyperactivity of 2023 but the combination of wildfires in Ontario and a heat dome in the central US spells smoky trouble for millions.
