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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 02/25/26 (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 +]		 WBY Moderate 85 Particulate < 10 micrometers 123 µg/m3 24-hour 2 PM
Ft. Collins - Greeley
[expand +]		 FTCW Good 41 Ozone 44 PPB 8-hour 6 PM
Colorado Springs
[expand +]		 MAN Good 40 Ozone 43 PPB 8-hour 12 AM
Grand Junction
[expand +]		 GJPB Good 44 Particulate < 2.5 micrometers 7 µg/m3 24-hour 9 AM
Pueblo
[expand +]		 PWES Good 35 Ozone 38 PPB 8-hour 11 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 28 Ozone 30 PPB 8-hour 8 PM
Four Corners
[expand +]		 PAG Good 37 Particulate < 10 micrometers 40 µg/m3 24-hour 7 AM
Steamboat Springs
[expand +]		 SSMB Good 29 Particulate < 10 micrometers 31 µg/m3 24-hour 1 AM
Aspen
[expand +]		 ASPN Good 34 Ozone 37 PPB 8-hour 10 PM
Other
[expand +]		 DELT Good 46 Particulate < 2.5 micrometers 8 µg/m3 24-hour 1 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 48 0.048 0.053 12 PM

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