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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 09/11/26 (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
[expand +]		 NREL Moderate 67 Ozone 60 PPB 8-hour 4 PM
Ft. Collins - Greeley
[expand +]		 FTCW Good 50 Ozone 54 PPB 8-hour 1 AM
Colorado Springs
[expand +]		 CCOL Moderate 63 Particulate < 10 micrometers 79 µg/m3 24-hour 10 PM
Grand Junction
[expand +]		 PAL Good 46 Ozone 50 PPB 8-hour 1 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 39 Ozone 42 PPB 8-hour 6 PM
Four Corners
[expand +]		 CTZ Good 41 Ozone 44 PPB 8-hour 5 PM
Other
[expand +]		 ALA Good 33 Particulate < 2.5 micrometers 6 µg/m3 24-hour 8 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 76 0.064 0.044 11 AM

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