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The Colorado Department of Public Health and Environment and the Regional Air Quality Council have issued an OZONE ACTION DAY ALERT at 4 p.m. on Wednesday, June 18, 2025 for the Front Range Urban Corridor from Douglas County north to Larimer and Weld counties, including the Denver-Boulder area, Fort Collins and Greeley.
Ozone is expected to be in the Good to Moderate range on Wednesday. However, hot, sunny, and stagnant weather will allow ozone to reach the Unhealthy for Sensitive Groups category on Thursday. The highest ozone concentrations are expected in southern and western portions of the Denver Metro area, along the I-25 corridor towards Fort Collins, and Greeley.
This Ozone Action Day Alert will remain in effect until at least 4 p.m. Thursday, June 19, 2025.
For statewide conditions, forecasts and advisories, visit:
https://www.colorado.gov/airquality/colorado_summary.aspx
The highest Ozone related AQI at 6 o'clock AM Mountain Standard Time on June 19, 2025, is 48 which indicates Good ozone air quality. It was recorded by the RFN ambient ozone monitor.
The highest Particulate Matter (PM2.5) related AQI at 6 o'clock AM Mountain Standard Time on June 19, 2025, is 46 which indicates Good Particulate Matter (PM2.5) air quality. It was recorded by the PMS ambient monitor.
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| FRONT RANGE AIR QUALITY FORECAST: Wednesday, June 18, 2025, 2:30 PM MDT Ozone concentrations are expected to be in the Good to Moderate range on Wednesday, and in the Moderate to Unhealthy for Sensitive Groups range on Thursday. On Wednesday, moderate concentrations are possible throughout the Northern Front Range Region, and people who are unusually sensitive to ozone should consider reducing prolonged or heavy outdoor exertion from noon to 8 pm. On Thursday, the highest concentrations are most likely in southern and western portions of the Denver Metro area, along the I-25 corridor towards Fort Collins, and along the Platte River Valley towards Greeley. In these locations, people who are unusually sensitive to ozone should reduce prolonged or heavy outdoor exertion from noon to 8 pm. Fine Particulate Matter concentrations are expected to be in the Good category on Wednesday and Thursday. Carbon Monoxide concentrations are expected to be in the Good category on Wednesday and Thursday. Nitrogen Dioxide concentrations are expected to be in the Good category on Wednesday and Thursday. Visibility on Thursday is expected to be Good to Moderate. COLORADO SMOKE OUTLOOK: Thursday, July 11, 2024, 8:40 AM MDT 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. No major public health impacts are expected due to smoke (fine particulates), however unusually sensitive people, should consider reducing prolonged or heavy exertion on Thursday. 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? The focus of the Colorado Smoke Outlook is on large fires (e.g., greater than 100 acres in size). Nevertheless, smoke from smaller fires, prescribed fires, and/or smoke from new fires not yet known to CDPHE air quality meteorologists may cause locally heavy smoke. If there is smoke in your neighborhood, see the public health recommendations below. Public health recommendations for areas affected by smoke: If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and the elderly. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. To temporarily relocate to an area with better air quality, consider using this map (https://fire.airnow.gov/) to identify the best area closest to you. IF VISIBILITY IS LESS THAN 5 MILES IN SMOKE IN YOUR NEIGHBORHOOD, SMOKE HAS REACHED LEVELS THAT ARE UNHEALTHY. |
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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. (http://www.SimpleStepsBetterAir.org), 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 https://www.colorado.gov/airquality/brochure.aspx
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:
https://www.colorado.gov/airquality/advisory.aspx
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:
https://www.colorado.gov/airquality/request_alerts.aspx(CDPHE automated e-mail alerts)
http://www.enviroflash.info/signup.cfm(CDPHE forecasts via automated e-mails from the EPA)
Forecasts & Monitoring
