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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 12/21/25 (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 +]		 LNGM Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 6 PM
Ft. Collins - Greeley
[expand +]		 PMS Moderate 57 Particulate < 2.5 micrometers 12 µg/m3 24-hour 6 PM
Colorado Springs
[expand +]		 ACAD Good 26 Ozone 28 PPB 8-hour 6 PM
Grand Junction
[expand +]		 GJPB Moderate 55 Particulate < 2.5 micrometers 11 µg/m3 24-hour 6 PM
Pueblo
[expand +]		 PWES Good 27 Ozone 29 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFL Good 24 Particulate < 2.5 micrometers 4 µg/m3 24-hour 6 PM
Four Corners
[expand +]		 CTZ Good 29 Ozone 31 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 27 Particulate < 2.5 micrometers 4 µg/m3 24-hour 6 PM
Aspen
[expand +]		 ASPN Good 32 Ozone 35 PPB 8-hour 6 PM
Other
[expand +]		 DELT Moderate 55 Particulate < 2.5 micrometers 11 µg/m3 24-hour 6 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 +]		 LNGM Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 6 PM
Ft. Collins - Greeley
[expand +]		 PMS Moderate 57 Particulate < 2.5 micrometers 12 µg/m3 24-hour 6 PM
Colorado Springs
[expand +]		 MAN Good 29 Ozone 31 PPB 8-hour 2 PM
Grand Junction
[expand +]		 GJPB Moderate 59 Particulate < 2.5 micrometers 13 µg/m3 24-hour 1 AM
Pueblo
[expand +]		 PWES Good 29 Ozone 31 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFL Good 31 Particulate < 2.5 micrometers 5 µg/m3 24-hour 1 AM
Four Corners
[expand +]		 PAG Good 29 Particulate < 2.5 micrometers 5 µg/m3 24-hour 1 AM
Steamboat Springs
[expand +]		 SSMB Good 27 Particulate < 2.5 micrometers 4 µg/m3 24-hour 6 PM
Aspen
[expand +]		 ASPN Good 32 Ozone 35 PPB 8-hour 6 PM
Other
[expand +]		 DELT Moderate 55 Particulate < 2.5 micrometers 11 µg/m3 24-hour 12 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 43 0.044 0.057 4 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