Colorado
Translate
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 03/21/26 (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 +]		 RFN Good 45 Ozone 49 PPB 8-hour 2 PM
Ft. Collins - Greeley
[expand +]		 FTCW Good 39 Ozone 42 PPB 8-hour 2 PM
Colorado Springs
[expand +]		 MAN Good 42 Ozone 45 PPB 8-hour 2 PM
Grand Junction
[expand +]		 GJPB Good 23 Particulate < 2.5 micrometers 4 µg/m3 24-hour 2 PM
Pueblo
[expand +]		 PWES Good 37 Ozone 40 PPB 8-hour 2 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 25 Ozone 27 PPB 8-hour 2 PM
Four Corners
[expand +]		 CTZ Good 32 Ozone 35 PPB 8-hour 2 PM
Steamboat Springs
[expand +]		 SSMB Good 22 Particulate < 2.5 micrometers 3 µg/m3 24-hour 2 PM
Aspen
[expand +]		 ASPN Good 36 Ozone 39 PPB 8-hour 2 PM
Other
[expand +]		 DELT Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 2 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 15 0.022 0.018 2 PM

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 ADB Moderate 54 Particulate < 10 micrometers 62 µg/m3 24-hour 3 AM
Ft. Collins - Greeley
[expand +]		 LAST Good 41 Ozone 44 PPB 8-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 42 Ozone 45 PPB 8-hour 1 AM
Grand Junction
[expand +]		 GJPB Good 26 Particulate < 2.5 micrometers 4 µg/m3 24-hour 7 AM
Pueblo
[expand +]		 PWES Good 37 Ozone 40 PPB 8-hour 1 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 25 Ozone 27 PPB 8-hour 2 PM
Four Corners
[expand +]		 CTZ Good 32 Ozone 35 PPB 8-hour 2 PM
Steamboat Springs
[expand +]		 SSMB Good 22 Particulate < 2.5 micrometers 4 µg/m3 24-hour 3 AM
Aspen
[expand +]		 ASPN2 Good 37 Particulate < 10 micrometers 40 µg/m3 24-hour 2 AM
Other
[expand +]		 DELT Moderate 52 Particulate < 2.5 micrometers 9 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 28 0.033 0.030 11 AM

* 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