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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 12/16/25 (Yesterday)

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 63 Particulate < 10 micrometers 80 µg/m3 24-hour 8 AM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 59 Particulate < 2.5 micrometers 13 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 43 Ozone 46 PPB 8-hour 3 PM
Grand Junction
[expand +]		 GJPB Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 12 AM
Pueblo
[expand +]		 PWES Good 40 Ozone 43 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFL Good 23 Particulate < 2.5 micrometers 4 µg/m3 24-hour 3 AM
Four Corners
[expand +]		 PAG Good 41 Particulate < 10 micrometers 44 µg/m3 24-hour 1 AM
Steamboat Springs
[expand +]		 SSMB Good 39 Particulate < 10 micrometers 42 µg/m3 24-hour 1 AM
Aspen
[expand +]		 ASPN2 Moderate 75 Particulate < 10 micrometers 103 µg/m3 24-hour 6 AM
Other
[expand +]		 DELT Moderate 57 Particulate < 2.5 micrometers 12 µg/m3 24-hour 6 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 36 0.039 0.029 12 PM

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