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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. 

Satellite view of western US with smoke (gray) and clouds (white) over Idaho and Montana.
On visible satellite imagery, smoke (gray) is visible over the Pacific Northwest and Canada. This smoke could move into Colorado on 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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