Colorado
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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 06/21/26

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 +]		 AURE Moderate 90 Ozone 67 PPB 8-hour 5 PM
Ft. Collins - Greeley
[expand +]		 GRET Moderate 84 Ozone 65 PPB 8-hour 5 PM
Colorado Springs
[expand +]		 MAN Moderate 71 Ozone 61 PPB 8-hour 8 PM
Grand Junction
[expand +]		 PAL Moderate 74 Ozone 62 PPB 8-hour 6 PM
Pueblo
[expand +]		 PWES Moderate 61 Ozone 58 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFL Good 36 Particulate < 2.5 micrometers 6 µg/m3 24-hour 11 PM
Four Corners
[expand +]		 CTZ Moderate 71 Ozone 61 PPB 8-hour 8 PM
Steamboat Springs
[expand +]		 SSMB Moderate 63 Particulate < 2.5 micrometers 15 µg/m3 24-hour 1 PM
Aspen
[expand +]		 ASPN Moderate 51 Ozone 55 PPB 8-hour 5 PM
Other
[expand +]		 TEL Moderate 51 Particulate < 2.5 micrometers 9 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 72 0.061 0.063 11 AM

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