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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 09/14/26 (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 59 Particulate < 10 micrometers 72 µg/m3 24-hour 4 PM
Ft. Collins - Greeley
[expand +]		 GREH Good 42 Particulate < 2.5 micrometers 7 µg/m3 24-hour 12 PM
Colorado Springs
[expand +]		 ACAD Good 42 Ozone 45 PPB 8-hour 4 PM
Grand Junction
[expand +]		 PAL Good 41 Ozone 44 PPB 8-hour 6 AM
Pueblo
[expand +]		 PWES Good 41 Ozone 44 PPB 8-hour 4 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 31 Ozone 33 PPB 8-hour 5 PM
Four Corners
[expand +]		 CTZ Good 36 Ozone 39 PPB 8-hour 2 AM
Steamboat Springs
[expand +]		 SSMB Good 18 Particulate < 2.5 micrometers 3 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN2 Good 13 Particulate < 2.5 micrometers 2 µg/m3 24-hour 2 AM
Other
[expand +]		 LMB Good 35 Particulate < 2.5 micrometers 6 µg/m3 24-hour 6 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 31 0.035 0.038 11 AM

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