How wildfire smoke can harm our health — even when source is hundreds of miles away

SMOKE FROM MORE than 100 wildfires burning across Canada has been rolling into North American cities far from the flames. New York City and Detroit were both listed among the five most polluted cities in the world because of the fires on June 7, 2023. The smoke has triggered air quality alerts in several states in recent weeks.

We asked Chris Migliaccio, a toxicologist at the University of Montana who studies the impact of wildfire smoke on human health, about the health risks people can face when smoke blows in from distant wildfires.