About 25 million people, or 8% of the population of the U.S., live in the Ohio River basin. The river spans 981 miles, ...

An air quality map shows conditions improving in the U.S. Friday as smoke from the Canadian wildfires subsides.

Smoke from wildfires in Canada has spread more than 5,000 miles, reaching parts of Russia and Europe during the past week.

Hundreds of acres in Michigan are covered in parallel rows of earth that are the remains of an ancient Native American ...