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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 08/20/26 (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 +]		 NREL Unhealthy for Sensitive Groups 101 Ozone 71 PPB 8-hour 7 PM
Ft. Collins - Greeley
[expand +]		 FOS Moderate 90 Ozone 67 PPB 8-hour 6 PM
Colorado Springs
[expand +]		 ACAD Moderate 54 Ozone 56 PPB 8-hour 7 PM
Grand Junction
[expand +]		 PAL Good 39 Ozone 42 PPB 8-hour 7 PM
Pueblo
[expand +]		 PWES Good 40 Ozone 43 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 37 Ozone 40 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Good 38 Ozone 41 PPB 8-hour 4 PM
Steamboat Springs
[expand +]		 SSMB Good 22 Particulate < 2.5 micrometers 3 µg/m3 24-hour 6 PM
Aspen
[expand +]		 ASPN Good 33 Ozone 36 PPB 8-hour 7 PM
Other
[expand +]		 ALA Good 44 Particulate < 2.5 micrometers 8 µg/m3 24-hour 6 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 67 0.059 0.053 11 AM

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