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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 12/03/25 (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 +]		 I25DEN Good 45 Particulate < 2.5 micrometers 8 µg/m3 24-hour 12 AM
Ft. Collins - Greeley
[expand +]		 PMS Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 34 Ozone 37 PPB 8-hour 2 AM
Grand Junction
[expand +]		 GJPB Moderate 54 Particulate < 2.5 micrometers 10 µg/m3 24-hour 5 PM
Pueblo
[expand +]		 PWES Good 32 Ozone 35 PPB 8-hour 6 AM
Colorado River Valley
[expand +]		 RIFL Good 37 Particulate < 2.5 micrometers 6 µg/m3 24-hour 6 PM
Four Corners
[expand +]		 CTZ Good 28 Ozone 30 PPB 8-hour 1 AM
Steamboat Springs
[expand +]		 SSMB Good 24 Particulate < 2.5 micrometers 4 µg/m3 24-hour 1 PM
Aspen
[expand +]		 ASPN Good 28 Ozone 30 PPB 8-hour 6 PM
Other
[expand +]		 DELT Moderate 59 Particulate < 2.5 micrometers 13 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
No valid VSI calculations found (12pm - 4pm)

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