How poor air quality hurts your health
Smoke from Canadian wildfires blanketed much of the Great Lakes region Wednesday, sending the air quality to unhealthy levels.

Chicago and Detroit were among the top three cities with the worst air quality in the world, according to the tracking service IQAir.com.

The National Weather Service said the ongoing wildfires in Canada are expected to bring poor air quality to parts of the United States —including the upper and middle Mississippi Valley, the Great Lakes region, the western Ohio Valley, the central Appalachians and the mid-Atlantic — for the next few days.

What causes poor air quality?

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