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 11/02/25

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
[expand +]		 NREL Moderate 54 Ozone 56 PPB 8-hour 9 PM
Ft. Collins - Greeley
[expand +]		 GREH Moderate 58 Particulate < 2.5 micrometers 12 µg/m3 24-hour 11 AM
Colorado Springs
[expand +]		 MAN Good 41 Ozone 44 PPB 8-hour 11 PM
Grand Junction
[expand +]		 PAL Good 35 Ozone 38 PPB 8-hour 7 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 26 Ozone 28 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Good 36 Ozone 39 PPB 8-hour 7 PM
Other
[expand +]		 ALA Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 12 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 64 0.058 0.051 1 PM

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