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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 08/25/26 (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 Moderate 93 Ozone 68 PPB 8-hour 7 PM
Ft. Collins - Greeley
[expand +]		 FOS Moderate 71 Ozone 61 PPB 8-hour 6 PM
Colorado Springs
[expand +]		 ACAD Moderate 77 Ozone 63 PPB 8-hour 5 PM
Grand Junction
[expand +]		 PAL Moderate 58 Ozone 57 PPB 8-hour 5 PM
Pueblo
[expand +]		 PWES Moderate 61 Ozone 58 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 48 Ozone 52 PPB 8-hour 4 PM
Four Corners
[expand +]		 CTZ Good 48 Ozone 52 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 23 Particulate < 2.5 micrometers 4 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN2 Good 17 Particulate < 2.5 micrometers 3 µg/m3 24-hour 3 PM
Other
[expand +]		 LMB Good 23 Particulate < 2.5 micrometers 4 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 92 0.071 0.064 12 PM

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