Ozone information

Colorado is in the midst of an effort to reduce ozone air pollution. High levels of ozone present health concerns for healthy adults and for sensitive people, particularly the elderly, young children and those with asthma or other respiratory ailments. Symptoms include:
  • Stinging eyes and throat.
  • Chest pains.
  • Coughing.
  • Breathing difficulty. 
Metropolitan Denver and the northern Front Range were classified as a "marginal" nonattainment area by the U.S. Environmental Protection Agency (EPA) effective July 20, 2012.
A nonattainment area is one in which air quality doesn’t meet the ozone standards set forth by the federal government in 2008, which is 75 parts per billion over an eight-hour period. 
The marginal nonattainment designation doesn’t impose any new planning requirements on Colorado at this time. However, the nonattainment area must meet the standard before 2015 or new requirements may be imposed.
Nonattainment area planning
Information pertinent to industry
EPA's proposed National Ambient Air Quality Standards (NAAQS) for ozone
Collaborating agencies