An air quality index of 300 or higher is considered hazardous, and the record-breaking smoke AQI in Grand Portage reached 800 on Tuesday.

From Sunday to Tuesday, smoke in northwest Canada swirled into the northern Plains, giving Minnesota some of the worst air quality in the world.

The smell of fire filled the air as thick smoke from wildfires in Canada blanketed part of the Midwest and created hazardous air quality on Tuesday.