CDPHE – Colorado.gov/AirQuality

Front Range
No Ozone Action Day Alert in Effect
Until at least 4 p.m. 07/17/2024
This is the Front Range Air Pollution Forecast effective 4PM on Tuesday, July 16, 2024:
No Advisories for Ozone or any other pollutant are in effect until at least 4 p.m. Wednesday, July 17, 2024 for the Front Range Urban Corridor from Douglas County north to Larimer and Weld counties, including the Denver-Boulder area, Fort Collins and Greeley.
Intermittent showers and thunderstorms will limit ozone development on Tuesday and Wednesday.
Should atmospheric conditions suggest increased ground-level ozone concentrations, the Colorado Department of Public Health and Environment and the Regional Air Quality Council will issue an ozone advisory. In addition, if conditions warrant, the Colorado Department of Public Health and Environment will issue advisories for other pollutants. Check this website ( often for a report on current air quality conditions and to learn if an ozone action day alert is in effect.
For statewide conditions, forecasts and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx
The highest Ozone related AQI at 1 o’clock AM Mountain Standard Time on July 17, 2024, is 67 which indicates Moderate ozone air quality. It was recorded by the RFN ambient ozone monitor. Unusually sensitive individuals may experience respiratory symptoms. Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
The highest Particulate Matter (PM2.5) related AQI at 1 o’clock AM Mountain Standard Time on July 17, 2024, is 48 which indicates Good Particulate Matter (PM2.5) air quality. It was recorded by the GREH ambient monitor.
Front Range Air Quality Forecast & Colorado Smoke Outlook
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FRONT RANGE AIR QUALITY FORECAST: Tuesday, July 16, 2024, 2:00 PM MDT Ozone concentrations are expected to be in the Good to Moderate range on Tuesday and Wednesday. Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion between the hours of noon and 8 pm on Tuesday and Wednesday. Fine Particulate Matter concentrations are expected to be in the Good category on Tuesday and Wednesday. Carbon Monoxide concentrations are expected to be in the Good category on Tuesday and Wednesday. Nitrogen Dioxide concentrations are expected to be in the Good category on Tuesday and Wednesday. Visibility on Tuesday is expected to be Good to Moderate. COLORADO SMOKE OUTLOOK: Smoke from out-of-state fires will begin affect northern Colorado by late Thursday morning, and is expected to continue spreading eastward as the day goes on. The majority of smoke will remain in the upper atmosphere, although some will mix down to the surface. Hazy skies are likely across much of northern and western Colorado. Light to moderate smoke is possible Thursday in northwest Colorado, especially Steamboat Springs, Craig, and Meeker. Light to moderate concentrations of smoke are also possible near small wildfires and prescribed burns around the state. What if there is a wildfire or smoke in your area? Public health recommendations for areas affected by smoke: |
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Ground-level ozone is an air pollution problem that impacts the health of all Coloradans. Exposure can cause acute respiratory problems and trigger asthma attacks. During Ozone Action Alerts, avoid rigorous outdoor activity during the heat of the day. Prolonged exposure can cause long-lasting damage to your lungs.
You CAN make a difference by doing your part to improve air quality along Denver’s Front Range. Even during periods of wildfire smoke, reducing your personal emissions can help decrease ozone production. Combining or skipping just two car trips a week has a positive impact on our air quality. Find other easy solutions that fit your lifestyle from Simple Steps. Better Air. ( a program of the Regional Air Quality Council.
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WHAT IS AN ACTION DAY?: An Action Day for fine particulate matter, carbon monoxide, ozone or other pollutants indicates that either current air quality is unhealthy or conditions are expected to worsen later in the day or on the next day. Action Days for air pollutants generally indicate that air quality will be in either the Unhealthy or Unhealthy-for-Sensitive-Groups categories according to the Air Quality Index. Action Days always convey overarching public health recommendations, and, according to season, trigger a variety of mandatory and voluntary pollution prevention measures. For example, during the summer open burning is prohibited when an Action Day for ozone and/or fine particulates is in effect. During the winter, residential burning restrictions are in effect when an Action Day for Visibility is in effect.
For a detailed description of both the AIR QUALITY INDEX and the VISIBILITY STANDARD INDEX please visit
COLORADO OPEN BURN FORECAST:
For those with permits for open burning, that is the burning of waste materials or vegetation outside, check the following webpage to find out if open burning is allowed today. Keep in mind that open burning is prohibited when an Action Day is in effect:
https://www.colorado.gov/airquality/burn_forecast.aspx
FOR CURRENT FRONT RANGE ACTION DAYS/ADVISORIES:
FOR CURRENT AIR QUALITY CONDITIONS STATEWIDE:
https://www.colorado.gov/airquality/air_quality.aspx
SOCIAL MEDIA:
https://www.facebook.com/cdphe.apcd
https://twitter.com/cdpheapcd
AIR QUALITY NOTIFICATIONS:
automated e-mail alerts)
forecasts via automated e-mails from the EPA)
link