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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 12/30/25 (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 56 Particulate < 2.5 micrometers 11 µg/m3 24-hour 5 PM
Ft. Collins - Greeley
[expand +]		 PMS Moderate 61 Particulate < 2.5 micrometers 14 µg/m3 24-hour 8 PM
Colorado Springs
[expand +]		 MAN Good 40 Ozone 43 PPB 8-hour 3 PM
Grand Junction
[expand +]		 GJPB Good 37 Particulate < 2.5 micrometers 6 µg/m3 24-hour 12 AM
Pueblo
[expand +]		 CAN Good 33 Particulate < 2.5 micrometers 5 µg/m3 24-hour 1 AM
Colorado River Valley
[expand +]		 RIFL Good 42 Particulate < 2.5 micrometers 7 µg/m3 24-hour 2 PM
Four Corners
[expand +]		 CTZ Good 25 Ozone 27 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 37 Particulate < 2.5 micrometers 6 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN Good 36 Ozone 39 PPB 8-hour 5 AM
Other
[expand +]		 ALA Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 7 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 103 0.078 0.076 3 PM

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