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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 08/17/26 (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 +]		 RFN Unhealthy for Sensitive Groups 115 Ozone 75 PPB 8-hour 8 PM
Ft. Collins - Greeley
[expand +]		 TIM Moderate 93 Ozone 68 PPB 8-hour 5 PM
Colorado Springs
[expand +]		 ACAD Moderate 97 Ozone 69 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Moderate 67 Ozone 60 PPB 8-hour 7 PM
Pueblo
[expand +]		 PWES Moderate 67 Ozone 60 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Moderate 51 Ozone 55 PPB 8-hour 6 PM
Four Corners
[expand +]		 CTZ Good 49 Ozone 53 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 16 Particulate < 2.5 micrometers 2 µg/m3 24-hour 7 AM
Aspen
[expand +]		 ASPN Good 48 Ozone 52 PPB 8-hour 6 PM
Other
[expand +]		 LMB Good 31 Particulate < 2.5 micrometers 5 µg/m3 24-hour 12 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 47 0.048 0.045 11 AM

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