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.

The Conversation, a nonprofit news website dedicated to unlocking knowledge from experts for the public, 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.

This article is republished from The Conversation under a Creative Commons license. It was updated June 7, 2023, with thick wildfire smoke over the U.S. Northeast and the latest map of smoke conditions. You can read the original article here.

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