Colorado Faces Tougher Limit Under New Smog RulesThe Environmental Protection Agency has listed metro Denver and 10 other cities as failing to meet federal smog standards after seven years.
Wildfire Haze In Colorado Could Stick Around For WeeksThe smoke and haze drifting from Pacific Northwest wildfires could hang around northern Colorado for weeks, the National Weather Service predicts.
Fighting Denver's Brown Cloud Could Mean 'Action Days' This WinterBrown clouds are common along the Front Range on very cold days with little wind to mix the atmosphere.
Some Colorado Counties Get Failing Grade When It Comes To OzoneA new report released from the American Lung Association shows there is still room for improvement of air quality across Colorado.
Smoke From High Park Fire Prompts Health AlertSmoke from the High Park Fire has prompted the Colorado Department of Public Health and Environment, along with the Regional Air Quality Council, to issue an Ozone Action Day Alert.
Regional Air Quality Council Kicks Off 'Action Days For Ozone'With the warmer temperatures come ozone alerts. The Regional Air Quality Council kicked off those alerts on Wednesday.