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 09/16/26

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
[expand +]		 ADB Moderate 53 Particulate < 10 micrometers 59 µg/m3 24-hour 4 PM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 1 AM
Colorado Springs
[expand +]		 ACAD Good 44 Ozone 47 PPB 8-hour 7 PM
Grand Junction
[expand +]		 PAL Good 34 Ozone 37 PPB 8-hour 1 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 32 Ozone 35 PPB 8-hour 4 PM
Four Corners
[expand +]		 CTZ Good 37 Ozone 40 PPB 8-hour 9 PM
Other
[expand +]		 LMB Good 28 Particulate < 10 micrometers 30 µg/m3 24-hour 5 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 81 0.066 0.075 2 PM

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