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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 07/18/25 (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
[expand +]		 AURE Moderate 93 Ozone 68 PPB 8-hour 5 PM
Ft. Collins - Greeley
[expand +]		 LAST Moderate 84 Ozone 65 PPB 8-hour 7 PM
Colorado Springs
[expand +]		 ACAD Moderate 64 Ozone 59 PPB 8-hour 4 PM
Grand Junction
[expand +]		 GJPB Moderate 63 Particulate < 2.5 micrometers 15 µg/m3 24-hour 1 AM
Colorado River Valley
[expand +]		 RIFL Moderate 71 Particulate < 2.5 micrometers 19 µg/m3 24-hour 11 AM
Four Corners
[expand +]		 PAG Moderate 55 Particulate < 2.5 micrometers 11 µg/m3 24-hour 1 AM
Other
[expand +]		 DELT Moderate 70 Particulate < 2.5 micrometers 19 µg/m3 24-hour 1 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 97 0.074 0.075 3 PM

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