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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 01/15/26 (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 +]		 ADB Good 49 Particulate < 10 micrometers 53 µg/m3 24-hour 11 PM
Ft. Collins - Greeley
[expand +]		 GREH Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 9 AM
Colorado Springs
[expand +]		 MAN Good 43 Ozone 46 PPB 8-hour 7 PM
Grand Junction
[expand +]		 GJPB Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 2 AM
Pueblo
[expand +]		 PWES Good 41 Ozone 44 PPB 8-hour 9 PM
Colorado River Valley
[expand +]		 RIFL Good 27 Particulate < 2.5 micrometers 4 µg/m3 24-hour 6 PM
Four Corners
[expand +]		 PAG Good 34 Particulate < 2.5 micrometers 6 µg/m3 24-hour 12 PM
Steamboat Springs
[expand +]		 SSMB Good 33 Particulate < 2.5 micrometers 5 µg/m3 24-hour 2 PM
Aspen
[expand +]		 ASPN Good 33 Ozone 36 PPB 8-hour 4 PM
Other
[expand +]		 DELT Moderate 55 Particulate < 2.5 micrometers 11 µg/m3 24-hour 5 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 42 0.043 0.038 12 PM

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