Heavy snow and difficult travel expected again, heaviest snow in southern Minnesota

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Hazy skies hung over parts of the midwest and northeastern U.S. on Sunday, caused by smoke drifting across the border from hundreds of wildfires in Canada.

Canada is experiencing its second worst wildfire season on record, according to government data, with almost 4,000 fires recorded already this calendar year.

Smoke coming across the border has affected air quality in several U.S. states. This weekend, air quality reached concerning levels across Wisconsin, Michigan, and Minnesota. Parts of Illinois and Indiana are also under air quality alerts. People in New York, Vermont, New Hampshire, and Maine are also being advised to limit outdoor activity due to pollution from the smoke.

National Weather Service Lead Forecaster Bob Oravec told NPR that the current wind patterns are once again driving the spread of polluted air into the U.S. from Canada.

"Air is moving at all levels and a lot of times it'll move in the same direction through the whole depth of the atmosphere, so the smoke is rising into the winds and the winds just transport it downstream, like anything — like a leaf getting blown," Oravec explained.

On Friday, Minnesota's Pollution Control Agency 

 reports the state is currently under its longest air quality alert since the Minnesota Pollution Control Agency began issuing alerts in 2008. The alert is expected to last seven days in total.

Conditions started improving in some areas of Minnesota on Sunday. Earlier this weekend, the agency reported it expected the air quality index (AQI) to reach the most severe level of "red" for all of the state, which is considered unhealthy for everyone.

In a statement, the Pollution Control Agency warned that even healthy people may experience symptoms such as irritated eyes, coughing, or shortness of breath. Others could feel more serious impacts, the agency said.

"Sensitive or more exposed individuals may experience more serious health effects, including worsening of existing heart or lung disease and respiratory and cardiovascular conditions, possibly leading to an asthma attack, heart attack, or stroke," according to the Pollution Control Agency statement.

Elsewhere, the Wisconsin Department of Natural Resources extended its air quality alert for several counties until noon on Monday, August 4th, 

 part of the state. Health officials in Michigan also 

 reported that more than 700 active fires were burning across Canada on Sunday, mostly in the southern province of Manitoba, directly to the north of Minnesota. The agency says more than 500 are burning out of control. Thousands of Canadians 

Wildfires have been raging in parts of Canada for much of the year. In May, two people who were trapped by a wildfire in southeastern Manitoba were killed. In June, parts of the U.S. experienced similar conditions from the smoke.

Oravec says poor air quality could impact areas of the U.S. for some time.

"It looks like that pattern maintains itself going forward through this week, so it doesn't really appear to be any big break. There may be a day or so where there's a temporary break to it, but overall it looks like there is potential for additional smoke to be transported southeastward into the United States," he said.

Air quality tracker IQAir ranked the air quality in 

 among the most polluted in the U.S. on Sunday afternoon.

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Kristin Wright

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Health officials from Minnesota to Maine have issued alerts warning of poor air quality from wildfires burning in Canada. People are advised to limit outdoor exposure. 

Canada wildfires cause poor air quality in the midwest and northeast U.S.

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