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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 10/25/26 (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 +]		 CHAT Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 9 PM
Ft. Collins - Greeley
[expand +]		 MFP Good 32 Ozone 35 PPB 8-hour 6 PM
Colorado Springs
[expand +]		 CCOL Good 46 Particulate < 2.5 micrometers 8 µg/m3 24-hour 12 AM
Grand Junction
[expand +]		 PAL Good 35 Ozone 38 PPB 8-hour 8 PM
Pueblo
[expand +]		 CAN Good 24 Particulate < 2.5 micrometers 4 µg/m3 24-hour 11 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 30 Ozone 32 PPB 8-hour 8 PM
Four Corners
[expand +]		 CTZ Good 34 Ozone 37 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 18 Particulate < 2.5 micrometers 3 µg/m3 24-hour 6 AM
Aspen
[expand +]		 ASPN2 Good 10 Particulate < 2.5 micrometers 1 µg/m3 24-hour 2 AM
Other
[expand +]		 DELT Good 19 Particulate < 2.5 micrometers 3 µg/m3 24-hour 10 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 115 0.087 0.084 2 PM

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