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Colorado Air Quality

Fort Collins is the worst air in Colorado right now at an index of 47, which is Good, from ground-level ozone. AirNow carries 16 reporting areas in the state. No air quality alert is in force.

Reporting areas: 16
Worst index now: 47
Alerts in force: 0
Towns under smoke: 0

Fine particles on the map

Forecast fine particulate matter from NOAA’s National Air Quality Forecast Capability over Colorado. Open it for the live map, where it pans and zooms.

Open the live map with the particulate forecast

Map layer from NOAA National Air Quality Forecast Capability. Boundaries from the Iowa Environmental Mesonet.

Alerts in force

An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.

None are in force in Colorado right now. All Colorado warnings.

By city, now and the days ahead16

Every AirNow reporting area in Colorado: what its monitors measured this hour, and what the state or local agency that forecasts for it expects today and tomorrow. Each area links to the nearest town’s page.

Reporting area	Now	Category now	Today	Tomorrow	Pollutant
Fort Collins	47	Good	Good	Good	Ozone
Colorado Springs	38	Good	Good	Good	Ozone
Denver-Boulder	38	Good	Good	Good	Ozone
Mesa Verde National Park	38	Good	Not forecast	Not forecast	Ozone
Grand Junction	34	Good	Good	Good	Ozone
Greeley	34	Good	Good	Good	Ozone
Pueblo	34	Good	Good	Good	Ozone
Colorado River Valley	30	Good	Good	Good	Ozone
Aspen	29	Good	Good	Good	Ozone
Four Corners Area	29	Good	Good	Good	Ozone
Southern Ute Indian Reservation	28	Good	Good	Not forecast	Ozone
San Luis Valley	15	Good	Good	Good	PM2.5
Lamar	13	Good	Good	Good	PM2.5
Steamboat Springs	13	Good	Good	Good	PM2.5
Telluride	13	Good	Good	Good	PM2.5
Rocky Mountain National Park		No reading	Moderate	Not forecast	Ozone

Smoke

NOAA’s analysts have not drawn wildfire smoke over any town in Colorado today.

Smoke on the radar over Colorado

What this means

The index runs from 0 to 500. Good is 0 to 50, Moderate to 100, Unhealthy for Sensitive Groups to 150, Unhealthy to 200, Very Unhealthy to 300, and Hazardous above that. The figure reported for a place is the highest index among the pollutants measured there, and the pollutant that produced it is named beside it.

What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.

Towns

Air quality for any town in Colorado: what is measured nearby, the category forecast for today and tomorrow, and NOAA’s model hour by hour. Largest first.

11 smaller towns

Smaller places have pages too; search for one on the air quality landing page.

Sources

Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.