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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 12/13/25

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 52 Particulate < 10 micrometers 57 µg/m3 24-hour 3 AM
Ft. Collins - Greeley
[expand +]		 PMS Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 2 PM
Colorado Springs
[expand +]		 ACAD Good 43 Ozone 46 PPB 8-hour 9 AM
Grand Junction
[expand +]		 GJPB Good 47 Particulate < 2.5 micrometers 8 µg/m3 24-hour 2 AM
Colorado River Valley
[expand +]		 RIFL Good 29 Particulate < 2.5 micrometers 5 µg/m3 24-hour 3 AM
Four Corners
[expand +]		 PAG Good 28 Particulate < 10 micrometers 30 µg/m3 24-hour 3 AM
Other
[expand +]		 DELT Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 26 0.031 0.033 4 PM

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