Explainer
How Canadian Wildfire Smoke Is Jeopardizing Health Across North America
Small particles can get lodged in crevices of organs from lungs to arteries, causing inflammation and other health issues.
Smoke from Canadian wildfires in Chicago on June 6.
Photographer: Scott Olson/Getty Images
The hazy air hovering over US metropolises, including Chicago and New York, this summer is reminding Americans of just how connected they are with their northern neighbor, regardless of how much relations have deteriorated under President Donald Trump.
Canadian provinces have evacuated towns and struggled to contain the second-worst wildfire season in 30 years, while residents of some US cities have endured unhealthy air as smoke from the blazes wafts across the border.