A maroon Air Quality Index indicates a health warning of emergency conditions, as everyone is likely to be affected.

It may be awhile before conditions improve.

Three major U.S. cities ranked among the worst in the world for air quality on Thursday after they were blanketed by fumes ...

The air quality in large parts of Michigan, Minneapolis and Minnesota is deemed "hazardous" by authorities.

With smoke from Canadian wildfires triggering air quality alerts across the Midwest, millions of people in cities like ...

Canadian wildfire smoke is affecting air quality across parts of the U.S. Here's who's at risk and how to protect yourself.

Wildfire smoke can linger in the air for weeks and is more toxic ​than normal air pollution; studies have linked it with ...

Canadian wildfire smoke is impacting air quality across Michigan and Metro Detroit. See a map. Check your air quality index.

Swiss company, IQAir, ranks Detroit No. 1 on list of major global cities with most polluted air.

New York City is forecast to have worse-quality air than Delhi on Thursday, as massive wildfires in Canada push hazy skies ...

Some cities in the U.S. are seeing their air quality suffer due to smoke from Canadian wildfires.

Much of the U.S. is shrouded in smoke. Wildfires burning across Canada have sent plumes of air pollution to the Midwest and ...