1:15
Overnight, Minneapolis was expected to have medium to heavy smoke levels reaching the surface, with officials warning residents, especially those with allergies, to make sure their windows are closed through Monday morning.
By sunrise on Monday, the wildfire smoke in the U.S. was much weaker, with medium levels reaching from Wisconsin to southern Minnesota.
![\"PHOTO:](\"http://a.abcnews.com/images/US/download-2_1715556721644_hpEmbed_16x9_384.jpg\")
By Monday evening, Omaha, Nebraska, is projected to experience some hazier skies due to the flow of the wildfire smoke.
Year-to-date, there have been more than 950 wildfires in Canada -- nearly triple the number from three weeks ago, officials said.
The effects of wildfire smoke are an increasing worry across the United States that is only expected to worsen, according to a study released in February.
By mid-century, the effects of wildfire smoke could bring startling health risks to 125 million Americans, according to the First Street Foundation, a climate-risk data provider.
In June 2023, smoke from the Canadian wildfires blanketed parts of the Northeast and Midwest with a thick, orange haze.
Eighteen states at the time, from Montana to New York and as far south as Georgia, were under air quality alerts, according to AirNow. New York City topped the list of the world's worst air quality rankings by a landslide, according to IQ Air.
Wildfire smoke poses health risks to everyone, but especially individuals with existing health conditions. It's associated with strokes, heart disease, respiratory disease, lung cancer, and early death, according to the U.S. Environmental Protection Agency.
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