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 07/02/26 (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 +]		 RFN Unhealthy for Sensitive Groups 136 Ozone 81 PPB 8-hour 7 PM
Ft. Collins - Greeley
[expand +]		 FOS Unhealthy for Sensitive Groups 126 Ozone 78 PPB 8-hour 7 PM
Colorado Springs
[expand +]		 MAN Moderate 90 Ozone 67 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Moderate 84 Ozone 65 PPB 8-hour 6 PM
Pueblo
[expand +]		 PFS Moderate 71 Particulate < 2.5 micrometers 19 µg/m3 24-hour 1 AM
Colorado River Valley
[expand +]		 RIFLO3 Moderate 77 Ozone 63 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Moderate 84 Ozone 65 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Moderate 78 Particulate < 2.5 micrometers 23 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN2 Unhealthy for Sensitive Groups 127 Particulate < 2.5 micrometers 45 µg/m3 24-hour 8 AM
Other
[expand +]		 DELT Unhealthy 157 Particulate < 2.5 micrometers 67 µg/m3 24-hour 2 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 114 0.085 0.083 2 PM

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