Hot, dry conditions and strong winds have made it difficult to contain the Cram fire, the largest active wildfire in the state.

Four of the five wildfires burning in Colorado have together consumed more than 19,300 acres, according to fire officials. How much Colorado land the fifth has burned is unknown.

Multiple U.S. states and Canadian provinces are experiencing poor air quality from wildfire smoke. Here's where.

The Dragon Bravo Fire has destroyed dozens of structures and a water treatment facility, and the White Sage Fire, located in Kaibab National Forest, has forced hundreds to evacuate.

At least four firefighters have been injured over the last week while battling three wildfires in Northern California forests that are burning amid extreme heat in steep, bone-dry terrain, fire officials said Monday.

Wildfires have scorched hotspots in several Mediterranean countries this month, with blazes forcing thousands of people into lockdown in Catalonia in Spain, and encroaching on France's second-biggest city of Marseille.

The Chicago area recorded ozone levels of 156 late Monday afternoon. Levels above 100 are considered unhealthy. Residents with respiratory issues, children and the elderly are advised to stay indoors and limit exposure to air outside until Tuesday evening.