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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 01/01/26 (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 +]		 LNGM Moderate 60 Particulate < 2.5 micrometers 13 µg/m3 24-hour 4 PM
Ft. Collins - Greeley
[expand +]		 GREH Moderate 72 Particulate < 2.5 micrometers 20 µg/m3 24-hour 9 AM
Colorado Springs
[expand +]		 MAN Good 39 Ozone 42 PPB 8-hour 4 PM
Grand Junction
[expand +]		 GJPB Moderate 60 Particulate < 2.5 micrometers 14 µg/m3 24-hour 3 PM
Pueblo
[expand +]		 PFS Good 35 Particulate < 2.5 micrometers 6 µg/m3 24-hour 9 AM
Colorado River Valley
[expand +]		 RIFL Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 6 PM
Four Corners
[expand +]		 PAG Good 33 Particulate < 2.5 micrometers 5 µg/m3 24-hour 1 PM
Steamboat Springs
[expand +]		 SSMB Good 40 Particulate < 2.5 micrometers 7 µg/m3 24-hour 5 AM
Aspen
[expand +]		 ASPN2 Good 40 Particulate < 2.5 micrometers 7 µg/m3 24-hour 2 AM
Other
[expand +]		 ALA Moderate 57 Particulate < 2.5 micrometers 12 µg/m3 24-hour 1 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 56 0.053 0.056 4 PM

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