Wildfire smoke from Canada is blanketing the skies in the Midwest, leaving millions with dangerous breathing conditions.

Canadian wildfire smoke is billowing south across the U.S. border, shrouding much of the Upper Midwest and Northern Tier and degrading air quality to hazardous levels. Air quality alerts cover the entirety of Iowa,

Meanwhile, the Midwest is getting blanketed in wildfire smoke from Canada, leaving millions under dangerous breathing conditions as more than 650 wildfires are burning in Canada, with 275 labeled as “out of control.