Colorado
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Detailed Air Quality Summary for 12/29/25 (Today)

Air Quality Forecasts and Advisories & Colorado Smoke Outlook
Learn more about monitoring sites: site descriptions and
real-time monitoring map

All data are collected real-time and have not been corrected nor validated.
Current Air Quality

Current Hour:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
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ADB Good 48 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Ft. Collins - Greeley
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GREH Good 48 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Colorado Springs
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MAN Good 28 Ozone 30 PPB 8-hour 11 PM
Grand Junction
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PAL Good 31 Ozone 33 PPB 8-hour 11 PM
Pueblo
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CAN Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Colorado River Valley       Valid data unavailable      
Four Corners
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CTZ Good 16 Ozone 17 PPB 8-hour 11 PM
Steamboat Springs
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SSMB Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Aspen
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ASPN Good 32 Ozone 35 PPB 8-hour 11 PM
Other
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ALA Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
Beta Extinction
(1/km)
Time *
(MST)

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
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I25DEN Good 49 Nitrogen Dioxide 52 PPB 1-hour 6 PM
Ft. Collins - Greeley
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GREH Good 48 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Colorado Springs
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MAN Good 36 Ozone 39 PPB 8-hour 11 AM
Grand Junction
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PAL Good 36 Ozone 39 PPB 8-hour 1 AM
Pueblo
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PWES Good 31 Ozone 33 PPB 8-hour 5 PM
Colorado River Valley
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RIFLO3 Good 18 Ozone 19 PPB 8-hour 1 AM
Four Corners
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CTZ Good 30 Ozone 32 PPB 8-hour 5 PM
Steamboat Springs
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SSMB Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Aspen
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ASPN Good 35 Ozone 38 PPB 8-hour 5 PM
Other
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ALA Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
Beta Extinction
(1/km)
Time *
(MST)
Denver DES Poor 112 0.084 0.106 12 PM

* All data are reported in Mountain Standard Time (MST). During daylight savings time add one hour to the reported hour.

AQI health statements
Site information and abbreviations