The heavy smoke fromthe active wildfires in Canadais expected to hit parts of the United States. Rising heat, winds, and dry air sparked blazes in the Canadian provinces of Saskatchewan and Manitoba, according to the country'sDepartment of Natural Resources. Residents in the United States are expected to facepoor air qualityfrom the fires as soon as May 30. The fires have burned hundreds of thousands of acres in both provinces and resulted in the evacuation of at least 17,000 people, in what officials are calling "a very serious situation." Smoke from the blazes is expected to fall heavily over Midwestern states, including Wisconsin, Minnesota, and Michigan, and cut across the country to reach the Carolinas by May 31, according toFireSmoke Canada, a team of forecasters at the University of British Columbia. Natural Diasters:Photos show Swiss village buried in debris after glacier collapse Authorities in Minnesota, which began to feel the impact of the blazes on May 29, warned of unhealthy levels of exposure to fine particles from the wildfires. Symptoms include everything from shortness of breath to heart attack and stroke. Taylor Ardrey is a news reporter for USA TODAY. You can reach her at tardrey@gannett.com. This article originally appeared on USA TODAY:Canada wildfires 2025: See photos of heavy smoke