109 million people face another day of poor air quality as smoke from blazes in Ontario drifts over the US Sign up for the Breaking News US newsletter email Tens of millions of Americans are enduring another day of smoky skies, irritated eyes and bad air quality, as Canadian wildfire smoke spread again over huge swathes of the US, affecting about 109 million people across the midwest, mid-Atlantic
Geopolitics The Guardian Jul 17, 2026