NBC News
Millions of people across the Upper Midwest and the Northeast are under air quality alerts Monday, as smoke from wildfires in Canada drift over the region
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Millions are under air quality alerts as wildfire smoke blankets large swaths of U.S.
Denise Chow
05:24
Millions of people across the Upper Midwest and the Northeast are under air quality alerts Monday, as smoke from wildfires in Canada drift over the region
