Smoke from hundreds of wildfires burning in Canada has made its way south of the border again this weekend, filling skies of the Upper Midwest with haze and sending air quality to unhealthy levels.

Much of the U.S. Upper Midwest on Saturday was dealing with swaths of unhealthy air due to drifting smoke from Canadian wildfires, covering the northern region of the U.S. at a time when people want to be enjoying lakes,

Smoke from wildfires is blanketing most of Manitoba and prompting extremely poor air quality on Friday. Environment Canada issued a warning for people in much of the province to limit time outside and to reschedule or cancel outdoor sports,