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 03/20/26 (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 +]		 ADB Moderate 55 Particulate < 10 micrometers 64 µg/m3 24-hour 2 PM
Ft. Collins - Greeley
[expand +]		 LAST Moderate 51 Ozone 55 PPB 8-hour 7 PM
Colorado Springs
[expand +]		 MAN Good 50 Ozone 54 PPB 8-hour 7 PM
Grand Junction       Valid data unavailable      
Pueblo
[expand +]		 CAN Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 41 Ozone 44 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Good 43 Ozone 46 PPB 8-hour 7 PM
Steamboat Springs
[expand +]		 SSMB Good 22 Particulate < 2.5 micrometers 3 µg/m3 24-hour 2 AM
Aspen
[expand +]		 ASPN Good 40 Ozone 43 PPB 8-hour 5 PM
Other
[expand +]		 LMB Good 34 Particulate < 2.5 micrometers 6 µg/m3 24-hour 12 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 56 0.053 0.040 11 AM

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