Most of Minnesota and parts of Montana, North Dakota and Wisconsin were ranked “unhealthy” for air quality on a U.S. Environmental Protection Agency map.

A wildfire burning in Grand Canyon National Park triggered a chlorine gas leak Friday afternoon after flames reached a water ...

Wildfires have forced evacuations at two national parks in the U.S. West. Black Canyon of the Gunnison National Park in Colorado closed Thursday after lightning sparked fires on both rims.

Parts of Grand Canyon National Park, a popular natural wonder in the western United States, remained closed due to two ...

The White Sage Fire near the North Rim has grown to more than 19,000 acres, authorities said, while the nearby Dragon Bravo Fire has burned at least 5,000 acres.

Crews are currently battling the lightning-caused fire, which has burned over 19,000 acres of land near Fredonia.

The White Sage and Dragon Bravo fires have burned a combined 24,000 acres, only miles apart from one another near the Grand ...

The wildfire closed the North Rim's visitor center and forced the evacuations of anyone living nearby, as firefighters ...

Fast-spreading wildfires have forced the evacuation of part of the Grand Canyon, with the US National Park Service ordering ...

Much of the Upper Midwest on Saturday was dealing with swaths of unhealthy air because of drifting smoke from Canadian ...

Multiple fast-spreading wildfires have forced evacuations in parts of the Grand Canyon in the US state of Arizona, with the US National Park Service ordering visitors and residents away from its ...

Authorities increased the size of the evacuation zone for the White Sage Fire north of the Grand Canyon on Friday morning.