Air quality advisories


Daily recorded statewide advisories and forecasts

Call 303-782-0211- Air Quality Forecast and Information Line or 

303-758-4848- Air Quality Advisory Line

Colorado Air Quality Advisories

Current air quality conditions, and forecasts for the front range/Denver metro area and other regions throughout the State.

Colorado Smoke Outlook

Current information on wildfire smoke throughout the State.

Colorado Air Quality Alerts

Sign up to receive email updates about air quality.

Action Days

  • When conditions warrant, the forecast will call for an Action Day.
  • An Action Day for fine particulates, carbon monoxide or ozone indicates current air quality is unhealthful or conditions are expected to worsen later in the day or on the next day.
  • Action Days for air pollutants generally mean air quality will be in the Unhealthy or Unhealthy-for-Sensitive-Groups categories, according to the Air Quality Index.
  • In the seven-county metro Denver area, Action Days trigger mandatory residential burning restrictions during the winter months, voluntary driving reductions and public health recommendations.
  • Residential burning restrictions apply between Nov. 1 and March 31.

Denver-area wintertime residential burning restrictions

Ozone advisories

  • Ozone advisories statewide occur both in summer and winter, though in the Denver area they’re more common in summer.
  • When ground-level ozone concentrations are expected to reach unhealthful levels, our forecasts will indicate an Action Day for ozone is in effect.
    • We then encourage voluntary reductions in driving, lawn mowing, painting and other activities that release ozone-forming hydrocarbons and volatile chemical compounds.
  • When no Action Day is indicated, air quality is good or moderate and is expected to remain so during the effective period of the forecast.
    • No restrictions are in place.

Information on ozone