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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 01/14/26 (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 +]		 I25DEN Good 43 Nitrogen Dioxide 46 PPB 1-hour 7 PM
Ft. Collins - Greeley
[expand +]		 GREH Good 45 Particulate < 2.5 micrometers 8 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 37 Ozone 40 PPB 8-hour 1 AM
Grand Junction
[expand +]		 GJPB Moderate 57 Particulate < 2.5 micrometers 12 µg/m3 24-hour 8 PM
Pueblo
[expand +]		 PWES Good 35 Ozone 38 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFL Good 26 Particulate < 2.5 micrometers 4 µg/m3 24-hour 8 AM
Four Corners
[expand +]		 PAG Good 37 Particulate < 2.5 micrometers 6 µg/m3 24-hour 5 AM
Steamboat Springs
[expand +]		 SSMB Good 39 Particulate < 2.5 micrometers 7 µg/m3 24-hour 1 AM
Aspen
[expand +]		 ASPN Good 31 Ozone 33 PPB 8-hour 3 AM
Other
[expand +]		 DELT Moderate 56 Particulate < 2.5 micrometers 11 µg/m3 24-hour 9 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 80 0.065 0.042 1 PM

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