In the U.S., wildfire smoke has reached states from Montana to Wisconsin but was especially heavy in Minnesota on Sunday.

"Fine particle levels are expected to reach the red air quality index (AQI) category, a level considered unhealthy for ...

More than 80 active wildfires burning across Canada are sending wildfire smoke back to Minnesota and Wisconsin Sunday. The ...

With over 100 active wildfires burning in Canada, wildfire smoke has drifted across the border into the United States, prompting Minnesota officials to issue the state's first air quality alert of ...

NEW YORK — With over 100 active wildfires burning in Canada, wildfire smoke has drifted across the border into the United States, prompting Minnesota officials to issue the state's first air ...