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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 03/17/26 (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 +]		 EVG Good 44 Ozone 47 PPB 8-hour 6 PM
Ft. Collins - Greeley
[expand +]		 FTCF Good 43 Particulate < 2.5 micrometers 7 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 42 Ozone 45 PPB 8-hour 6 PM
Grand Junction
[expand +]		 GJPB Good 42 Particulate < 2.5 micrometers 7 µg/m3 24-hour 2 PM
Pueblo
[expand +]		 PWES Good 37 Ozone 40 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 35 Ozone 38 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Good 40 Ozone 43 PPB 8-hour 7 PM
Steamboat Springs
[expand +]		 SSMB Good 21 Particulate < 2.5 micrometers 3 µg/m3 24-hour 9 AM
Aspen
[expand +]		 ASPN Good 39 Ozone 42 PPB 8-hour 6 PM
Other
[expand +]		 DELT Good 33 Particulate < 2.5 micrometers 5 µg/m3 24-hour 3 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 44 0.045 0.042 11 AM

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