Colorado
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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 11/05/25

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 63 Particulate < 10 micrometers 80 µg/m3 24-hour 12 AM
Ft. Collins - Greeley
[expand +]		 GREH Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 44 Ozone 47 PPB 8-hour 4 AM
Grand Junction
[expand +]		 GJPB Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 12 AM
Pueblo
[expand +]		 PFS Good 43 Particulate < 10 micrometers 46 µg/m3 24-hour 8 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 24 Ozone 26 PPB 8-hour 5 PM
Four Corners
[expand +]		 CTZ Good 36 Ozone 39 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 20 Particulate < 2.5 micrometers 3 µg/m3 24-hour 1 AM
Aspen
[expand +]		 ASPN Good 38 Ozone 41 PPB 8-hour 5 PM
Other
[expand +]		 LMB Good 45 Particulate < 10 micrometers 49 µg/m3 24-hour 10 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 121 0.091 0.083 3 PM

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