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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 12/25/25

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 +]		 LNGM Moderate 56 Particulate < 2.5 micrometers 11 µg/m3 24-hour 11 AM
Ft. Collins - Greeley
[expand +]		 PMS Moderate 72 Particulate < 2.5 micrometers 20 µg/m3 24-hour 11 AM
Colorado Springs
[expand +]		 ACAD Good 38 Ozone 41 PPB 8-hour 12 AM
Grand Junction
[expand +]		 PAL Good 35 Ozone 38 PPB 8-hour 3 PM
Pueblo
[expand +]		 PWES Good 35 Ozone 38 PPB 8-hour 10 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 28 Ozone 30 PPB 8-hour 6 PM
Four Corners
[expand +]		 PAG Good 39 Particulate < 2.5 micrometers 7 µg/m3 24-hour 12 PM
Steamboat Springs
[expand +]		 SSMB Good 36 Particulate < 2.5 micrometers 6 µg/m3 24-hour 5 AM
Aspen
[expand +]		 ASPN2 Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 1 AM
Other
[expand +]		 ALA Good 35 Particulate < 2.5 micrometers 6 µg/m3 24-hour 1 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 30 0.034 0.038 12 PM

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