It’s not uncommon for nasty winter and summer weather to disrupt flight schedules and other operations at Canada’s biggest and busiest airport, but officials at Toronto Pearson Airport in Mississauga say a relatively new threat has also emerged.

A group of Republican lawmakers has complained that smoke from Canadian wildfires is ruining summer for Americans, just days after voting for a major bill that will cause more of the planet-heating pollution that is worsening wildfires.

A Hazardous Weather Outlook is also in effect across the region. The National Weather Service issued the outlook because of smoke blanketing Wisconsin amid Canadian wildfires in Manitoba and Ontario. The smoke is being transported south by wind patterns, leading to air quality alerts and advisories across the state.

Minnesotans are inhaling another plume of smoke from Canada this week, and an attempt to blame Canada's handling of wildfires is being met with eye-rolls north of the border. Why it matters: Experts say smoky summers are likely the new normal in Minnesota and many parts of North America unaccustomed to dealing with the haze as climate change turns the continent's forests into tinderboxes.

IQAir, a Swiss air quality technology company, on Saturday morning ranked Montreal as the city with the worst air quality in the world.