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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 10/23/26 (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 Moderate 77 Particulate < 10 micrometers 107 µg/m3 24-hour 12 PM
Ft. Collins - Greeley
[expand +]		 FOS Good 44 Ozone 47 PPB 8-hour 7 PM
Colorado Springs
[expand +]		 MAN Good 42 Ozone 45 PPB 8-hour 12 AM
Grand Junction
[expand +]		 PAL Good 38 Ozone 41 PPB 8-hour 8 PM
Pueblo
[expand +]		 PWES Good 34 Ozone 37 PPB 8-hour 8 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 35 Ozone 38 PPB 8-hour 6 PM
Four Corners
[expand +]		 CTZ Good 31 Ozone 34 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 12 Particulate < 2.5 micrometers 2 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN2 Good 8 Particulate < 2.5 micrometers 1 µg/m3 24-hour 12 AM
Other
[expand +]		 LMB Good 30 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 56 0.053 0.058 3 PM

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