Wildfire smoke from Canada continues to drift across the United States, causing air quality alerts and health concerns.
The smoke has been seen as far south as the Gulf Coast and as far east as the Atlantic Ocean. It has also reached the Great Lakes, where it is causing hazy skies and poor air quality.
The smoke is a result of the unprecedented wildfire season in Canada. So far this year, more than 10 million acres have burned in Canada, making it the third-worst wildfire season on record. The fires have been driven by hot, dry weather and high winds.