A new report from the American Lung Association finds about half of U.S. children are living in areas with unhealthy air quality, and several Mountain West cities rank among the most polluted in the country.

Widespread drought is expected to drive a challenging wildfire season across Colorado and the region.

Arizona and other states are stuck in negotiations about sharing the river's water. Some have proposed breaking the standstill with a mediator.

Across the country, some 50 bald eagle nests fitted with cameras broadcast up-close views of raptor family life. Every spring, as eggs hatch and eaglets grow, these cameras rake in millions of views.

Widespread drought and fears of a power crisis is forcing the Interior Department to start sending billions of gallons of water from Flaming Gorge Reservoir downstream to prop up Lake Powell.

Utah's Great Salt Lake has been labeled an "environmental nuclear bomb" and it has the attention of the president of the United States.

The town of Cave Creek in Arizona is on the front lines of the Colorado River crisis. It will get help from Phoenix before working on long-term fixes.

Invasive species are on the march in the Colorado River, threatening everything from endangered native fish in Arizona to Colorado's juicy Palisade peaches.

As data centers rapidly expand across the Mountain West, researchers say a key question is getting harder to answer: how much water are they actually using?

Wind and solar power are rapidly expanding across the Mountain West, with some states now generating a significant share of their electricity from renewable sources, according to a new report from Climate Central, a nonpartisan research group.