The Smoke Cloud: How Wildfires in Canada Are Choking the US Toxic wildfire smoke from hundreds of blazes burning across Canada is blanketing major American cities, prompting unhealthy air quality alerts for millions.
The affected states stretch from the Midwest to the Northeast, with Chicago, Detroit, Washington D. C. , and Philadelphia among those hardest hit.
Canada's wildfire season has been a long time coming, and it shows no signs of abating. With nearly 900 fires burning – over 100 out of control – smoke is seeping into neighboring states.