Colorado
Translate
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 02/21/25 (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 METRO
[expand +]		 I25DEN Moderate 81 Particulate < 2.5 micrometers 25 µg/m3 24-hour 7 AM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 59 Particulate < 2.5 micrometers 13 µg/m3 24-hour 3 AM
Colorado Springs
[expand +]		 MAN Good 45 Ozone 49 PPB 8-hour 5 PM
Grand Junction
[expand +]		 PAL Good 39 Ozone 42 PPB 8-hour 6 PM
Pueblo
[expand +]		 CAN Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 3 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 29 Ozone 31 PPB 8-hour 4 PM
Four Corners
[expand +]		 CTZ Good 37 Ozone 40 PPB 8-hour 6 PM
Other
[expand +]		 ASPN Good 44 Ozone 47 PPB 8-hour 2 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 35 0.038 0.034 2 PM

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