A fire near the Grand Canyon National Park in Arizona has grown more than 20 times in size in 24 hours as an intensifying wildfire season sees the return of Canadian wildfire smoke into the U.S.

The Michigan Department of Environment, Great Lakes, and Energy issued southeast Michigan's sixth air quality advisory of the season on Saturday due to elevated levels of fine particulate matter in the air from Canadian wildfires.

Two wildfires in northern Arizona have burned thousands of acres, but so far, no structures have been damaged or destroyed. FOX 10's Nicole Krasean has the latest on the White Sage Fire and the Dragon Bravo Fire.

Wildfire smoke from Canada has made for bad air quality over parts of the Upper Midwest. Most of Minnesota had “unhealthy” air quality Saturday. That is according to a U.S.

The amount of land burned this year is on pace to be the most since 1994, as 100 blazes roared on Friday across the central Canadian province.

The Wolf Fire was just one of a spate of smaller-sized fires in the Inland Empire over the past two weeks, often near fast-growing residential areas. Hundreds of thousands of new housing units have been added in the wildland-urban interface in Riverside and San Bernardino counties over the past two decades,

New mapping shows the Green Mountain Fire, burning six miles south of Ovando, has scorched 18 acres, but officials say it's now 15% contained.Crews finished bu

Researchers at the University of Colorado Boulder found that wildfires in Colorado and throughout the western United States can dramatically alter the water quality of rivers and streams up to

A haze visible in parts of the Sacramento Valley is from multiple wildfires burning in Northern California. A north wind is pushing the smoke to the valley, and a high-pressure system is locking it in with little wind.