NASHVILLE, Tenn. (WKRN) — On Tuesday, air quality alerts were in effect for millions of Americans from Minnesota to New Hampshire. Thick smoke from Canadian wildfires has been the cause of the widespread air quality concerns.

On Tuesday, air quality was good for Middle Tennessee, but just to the north, it was unhealthy.

The poor air quality prompted the National Weather Service to issue some air quality alerts. The agency wants people to monitor for symptoms like wheezing, coughing, chest tightness, dizziness or a burning feeling in the nose, throat and eyes.

In the grey counties below, it's recommended that folks avoid strenuous outdoor activities, especially those who have heart disease and respiratory diseases like asthma.

All this smoke has been caused by dozens of massive wildfire

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