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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 10/03/26 (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 100 Ozone 70 PPB 8-hour 6 PM
Ft. Collins - Greeley
[expand +]		 FOS Good 49 Ozone 53 PPB 8-hour 7 PM
Colorado Springs
[expand +]		 ACAD Moderate 71 Ozone 61 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Good 44 Ozone 47 PPB 8-hour 7 PM
Pueblo
[expand +]		 PWES Good 45 Ozone 49 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 41 Ozone 44 PPB 8-hour 7 PM
Four Corners
[expand +]		 PAG Good 27 Particulate < 2.5 micrometers 4 µg/m3 24-hour 12 PM
Steamboat Springs
[expand +]		 SSMB Good 25 Particulate < 2.5 micrometers 4 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN2 Good 30 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Other
[expand +]		 DELT Good 27 Particulate < 2.5 micrometers 4 µg/m3 24-hour 4 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 0 0.004 0.000 12 PM

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