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 12/12/25

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.

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 ADB Moderate 61 Particulate < 10 micrometers 76 µg/m3 24-hour 7 AM
Ft. Collins - Greeley
[expand +]		 FTCW Good 37 Ozone 40 PPB 8-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 44 Ozone 47 PPB 8-hour 1 AM
Grand Junction
[expand +]		 GJPB Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 7 AM
Pueblo
[expand +]		 PWES Good 40 Ozone 43 PPB 8-hour 1 AM
Colorado River Valley
[expand +]		 RIFL Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Four Corners
[expand +]		 PAG Good 31 Particulate < 10 micrometers 33 µg/m3 24-hour 11 AM
Steamboat Springs
[expand +]		 SSMB Good 43 Particulate < 10 micrometers 46 µg/m3 24-hour 11 PM
Aspen
[expand +]		 ASPN2 Good 41 Particulate < 10 micrometers 44 µg/m3 24-hour 11 PM
Other
[expand +]		 DELT Moderate 51 Particulate < 2.5 micrometers 9 µg/m3 24-hour 1 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 87 0.069 0.067 3 PM

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