Colorado
Translate
Banner with Colorado and CDPHE logos on left with text on right reading Colorado Air Quality with Department of Public Health and Environment on the next line.

Detailed Air Quality Summary for 12/31/25 (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
[expand +]		 I25DEN Moderate 57 Particulate < 2.5 micrometers 12 µg/m3 24-hour 3 PM
Ft. Collins - Greeley
[expand +]		 GREH Moderate 58 Particulate < 2.5 micrometers 12 µg/m3 24-hour 3 PM
Colorado Springs
[expand +]		 MAN Good 34 Ozone 37 PPB 8-hour 3 PM
Grand Junction
[expand +]		 GJPB Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 3 PM
Pueblo
[expand +]		 PFS Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 3 PM
Colorado River Valley
[expand +]		 RIFL Good 22 Particulate < 2.5 micrometers 3 µg/m3 24-hour 3 PM
Four Corners
[expand +]		 PAG Good 21 Particulate < 2.5 micrometers 3 µg/m3 24-hour 3 PM
Steamboat Springs
[expand +]		 SSMB Good 38 Particulate < 2.5 micrometers 6 µg/m3 24-hour 3 PM
Aspen
[expand +]		 ASPN Good 30 Ozone 32 PPB 8-hour 3 PM
Other
[expand +]		 DELT Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 3 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 43 0.045 0.038 3 PM

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 I25DEN Moderate 58 Particulate < 2.5 micrometers 12 µg/m3 24-hour 11 AM
Ft. Collins - Greeley
[expand +]		 PMS Moderate 59 Particulate < 2.5 micrometers 13 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 34 Ozone 37 PPB 8-hour 3 PM
Grand Junction
[expand +]		 GJPB Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 2 PM
Pueblo
[expand +]		 PFS Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 3 AM
Colorado River Valley
[expand +]		 RIFL Good 24 Particulate < 2.5 micrometers 4 µg/m3 24-hour 1 AM
Four Corners
[expand +]		 PAG Good 21 Particulate < 2.5 micrometers 3 µg/m3 24-hour 1 PM
Steamboat Springs
[expand +]		 SSMB Good 39 Particulate < 2.5 micrometers 7 µg/m3 24-hour 1 PM
Aspen
[expand +]		 ASPN Good 33 Ozone 36 PPB 8-hour 4 AM
Other
[expand +]		 DELT Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 2 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 69 0.060 0.062 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