In Security, Fountain and Widefield, health officials have begun to trace the issue to nearby Peterson Air Force Base.
Energy and Environment
All Energy and Environment Stories
What the experts are discovering about climate change at Rocky Mountain, Black Canyon, Mesa Verde and Sand Dunes national parks.
The Forest Service is considering tightening access to Conundrum. Should other Colorado hot springs consider one too?
A new "biography" of coyotes explains their extraordinary resilience and why they spread from the West across North America
An ambitious project is symbolic of how land managers are approaching one of their biggest long-term issues: climate change.
The structural integrity of Spruce Tree House, one of the Southwest’s most popular archeological attractions, is a particular worry.
Cross your fingers for clear skies -- the annual Perseid meteor shower will peak later this week.
NPS says parks need to think more creatively in order to deal with a changing climate -- and visitation patterns.
Temperatures are rising at the park near Montrose. So more climbers are visiting earlier and later in the year -- but that has its issues too.
For decades some Westerners have tried to make it easier to clean up thousands of abandoned mines, but a solution remains elusive.
Nearly 70 individuals and businesses across Colorado, New Mexico, Utah and the Navajo Nation have filled out financial claims with the EPA.
Jonathan Jarvis, the director of the National Park Service, talks about climate change threats including wildfires, warming lakes and rising temperatures.
The Colorado River has a problem -- federal and state policies actually encourage water waste while subsidies provide incentive to grow water-thirsty crops.
The collection of dead critters helps researchers understand the coming changes to Rocky Mountain ecosystems.
Meet Jill Baron. The data she's collected from the same lake in Rocky Mountain National Park for 35 years has scientists worried.