At least four firefighters have been injured over the last week while battling three wildfires in Northern California forests ...

The Grand Canyon was formed with the shifting of tectonic plates, which lifted layers of rock into a high and relatively flat ...

The Chicago area recorded ozone levels of 156 late Monday afternoon. Levels above 100 are considered unhealthy. Residents ...

Wildfires are raging near the Grand Canyon National Park, forcing the closure of the park’s northern rim. One of the ...

Additional plumes of smoke from Canada's active wildfires prompt officials to issue a statewide air quality alert on July 14.

The Dragon Bravo Fire has destroyed dozens of structures and a water treatment facility, and the White Sage Fire, located in ...

Heavy winds that swept through Black Canyon of the Gunnison National Park on Sunday night started “rapid fire spread” after a ...

The Dragon Bravo Fire burning inside Grand Canyon National Park has destroyed dozens of structures, including a beloved and ...

Parts of Grand Canyon National Park remained closed to the public Sunday because of wildfires and the release of chlorine gas ...

Wildfires have forced evacuations for visitors and staff at two national parks — Gunnison and the Grand Canyon — in the U.S.

Grand Canyon National Park's North Rim was evacuated and will remain closed for the rest of the season because of the Arizona ...

The smoke Tuesday morning is likely to be the most noticeable we've seen so far this year in Denver. DENVER — The Denver area ...