President Trump has said he will roll back an Obama-era rule that would've matched federal emissions standards with California standards.
The U.S. Environmental Protection Agency is expected to downgrade the Front Range region's ozone to "serious."
Microscopic inhalable particles from wildfire smoke can get deep into the lungs and play havoc with those who suffer from heart and respiratory issues.
Emily Fischer and her team pilot a specially outfitted aircraft to research smoke and air quality.
Study co-author Ivan Rudik said air quality warnings issued by parks and other government agencies may be causing the visitation drop.
The Environmental Defense Fund believes most of the emissions come from leaks in storage tanks.
Research from atmospheric scientists in Boulder finds that personal care products can create emissions off your body at a level on par with your car’s tailpipe.
Even with rainier days ahead, fire bans are still in place and strictly enforced.
What's burning, what shouldn't be burning, and what it all does to the air we're breathing right now.
With natural gas remaking the energy landscape, here's Colorado's remaining coal-fired power plants in one map.