We are also closely monitoring other parts of Colorado for increasing wildfire smoke. East-central and southeastern parts of the state, including Burlington, Lamar, Colorado Springs, and Pueblo could see an increase in particle pollution overnight tonight and continue into the Friday morning commute. The same can be said for northwestern parts of the state with the possibility for a larger smoke intrusion tomorrow afternoon in places like Steamboat Springs and Granby. More information to follow as this situation continues to evolve.
The CDPHE Air Pollution Control Division periodically updates this page to provide information about smoke in Colorado. This page covers wildfire activity, prescribed burning operations, and the transport of smoke from out-of-state sources.
Si desea solicitar interpretación al español, envíe un mensaje por correo electrónico a cdphe_apcd_outreach@state.co.us
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Thursday, September 4, 2025
Wildfire smoke continues to increase
We are also closely monitoring other parts of Colorado for increasing wildfire smoke. East-central and southeastern parts of the state, including Burlington, Lamar, Colorado Springs, and Pueblo could see an increase in particle pollution overnight tonight and continue into the Friday morning commute. The same can be said for northwestern parts of the state with the possibility for a larger smoke intrusion tomorrow afternoon in places like Steamboat Springs and Granby. More information to follow as this situation continues to evolve.
Smoke arriving from out-of-state on Thursday
Smoke from fires in areas upwind from Colorado is now making its way toward, and into Colorado. Surface concentrations are currently in the Moderate category in most areas of Colorado, however the numbers have climbed in areas just to our north and east throughout the morning, and the this trend is expected to be seen in eastern Colorado as the day progresses.
Satellite image of the western United States shows a large plume of smoke across many states, reaching from the Pacific Northwest into Montana, Wyoming, and Nebraska. This smoke will make its way into Colorado on Thursday afternoon (smoke plume and likely path of travel indicated by red arrow). Image courtesy of RAMMB/CIRA.Increases in particulate concentrations will be seen first in the far northeastern portions of the state as surface smoke moves in, and daytime mixing of the atmosphere draws smoke aloft down to ground-level. Locations such as Sterling and Fort Morgan will be the first to notice this change.
Winds out of the north-northeast will then push the smoke further to the south and west. This will likely produce hazy skies and elevated particulate concentrations in many areas of eastern Colorado, including the Front Range.
Currently we do not expect that any Air Quality Health Advisories or Action Days will be necessary. Models and observations both indicate that the smoke plume is relatively concentrated, meaning that once the densest portion of the plume moves through, concentrations are likely to decrease once again. However in the short-term, we expect particulate levels to increase on Thursday afternoon and evening before relief arrives on Friday. If conditions worsen further than we expect them to, we will be watching closely and will issue Advisories as needed.
Folks who are sensitive to smoke and particulate pollution should begin taking steps to avoid exposure and reduce potential health impacts now. Helpful tips and actions can be found on our Smoke and Health page.
Stay informed by checking in here and on CDPHE's webpage for information regarding advisories. You can also see the location of the smoke plume and surface observations at EPA's Fire and Smoke Map.
Wednesday, September 3, 2025
More smoke arriving later this week
Many large wildfires are burning in the Pacific Northwest and British Columbia. Smoke from these fires could begin to impact northeastern Colorado by Thursday afternoon.
In the Pacific Northwest, particulate matter is in the Unhealthy for Sensitive Groups to Unhealthy Range today. Some smoke has made its way into Colorado, but particulate matter is in the Good to Moderate range today. Tomorrow, particulate matter could increase as the smoke to our north begins to push south.
By Thursday afternoon, the wind will begin to increase. Northerly winds will push smoke into northeastern Colorado. Smoke will hit Fort Collins, Greeley, Fort Morgan, Sterling, and Julesburg first. Then, it will continue to move south, hitting Boulder, Denver, and Colorado Springs. Particulate Matter concentrations will increase as the smoke moves in. If you are sensitive to smoke, take steps to protect your health on Thursday.
Visit the Idaho Smoke Blog or the Washington Smoke Blog for more information on smoke in the Pacific Northwest.
CDPHE is monitoring the situation and will issue an Air Quality Health Advisory if necessary.
Tuesday, September 2, 2025
Smoke heading towards Colorado
The fires in western Colorado have calmed down, but more smoke may be in the picture today.
Activity on the Derby Fire and Stoner Mesa Fire has slowed significantly. We do not expect heavy smoke from either of these fires today.
However, multiple fires are burning in the Pacific Northwest and Canada. This smoke may move into Colorado by Tuesday afternoon.
How much smoke are we talking? In eastern Colorado, there may be a noticeable haze this afternoon. Particulate Matter is expected to reach the Moderate level in locations along the Front Range and northeastern plains, including Fort Collins, Greeley, Sterling, Julesburg, Boulder, Denver, and Colorado Springs. If you are particularly sensitive to smoke, consider taking it easy today.
Smoke may also impact areas west of the Continental Divide. Locations in north-central Colorado, including Steamboat Springs, may see haze and increased particulate matter concentrations this afternoon.
The current weather pattern is expected to continue for the rest of this week. Continued northerly surface winds could bring more smoke into Colorado later this week. We will provide updates as necessary.
Currently, no Air Quality Health Advisories are in effect. CDPHE is monitoring the situation and will issue an advisory if conditions worsen.
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