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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 12/29/25 (Today)

Air Quality Forecasts and Advisories & Colorado Smoke Outlook
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.		 Current Air Quality

Current Hour:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 ADB Good 48 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Ft. Collins - Greeley
[expand +]		 GREH Good 48 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Colorado Springs
[expand +]		 MAN Good 28 Ozone 30 PPB 8-hour 11 PM
Grand Junction
[expand +]		 PAL Good 31 Ozone 33 PPB 8-hour 11 PM
Pueblo
[expand +]		 CAN Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Colorado River Valley       Valid data unavailable      
Four Corners
[expand +]		 CTZ Good 16 Ozone 17 PPB 8-hour 11 PM
Steamboat Springs
[expand +]		 SSMB Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Aspen
[expand +]		 ASPN Good 32 Ozone 35 PPB 8-hour 11 PM
Other
[expand +]		 ALA Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 I25DEN Good 49 Nitrogen Dioxide 52 PPB 1-hour 6 PM
Ft. Collins - Greeley
[expand +]		 GREH Good 48 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Colorado Springs
[expand +]		 MAN Good 36 Ozone 39 PPB 8-hour 11 AM
Grand Junction
[expand +]		 PAL Good 36 Ozone 39 PPB 8-hour 1 AM
Pueblo
[expand +]		 PWES Good 31 Ozone 33 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 18 Ozone 19 PPB 8-hour 1 AM
Four Corners
[expand +]		 CTZ Good 30 Ozone 32 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 11 PM
Aspen
[expand +]		 ASPN Good 35 Ozone 38 PPB 8-hour 5 PM
Other
[expand +]		 ALA Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 112 0.084 0.106 12 PM

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

AQI health statements
Site information and abbreviations