Air quality advisories

For daily recorded statewide advisories and forecasts call: 

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


303-758-4848- Air Quality Advisory Line  

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