A smokey haze from Canada’s worst-ever early wildfire season is expected to be a regular occurrence across some regions of North America as the hottest months of the year approach.On Friday, about half of the United States population was under some form of air quality warning – either due to the northern blazes or to a relentless heat wave in the south.Across the US Midwest and East, about 100 million Americans faced another day of smoky skies.
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