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 04/28/25

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 METRO
[expand +]		 AURE Moderate 84 Ozone 65 PPB 8-hour 3 PM
Ft. Collins - Greeley
[expand +]		 FTCW Moderate 74 Ozone 62 PPB 8-hour 4 PM
Colorado Springs
[expand +]		 MAN Moderate 77 Ozone 63 PPB 8-hour 7 PM
Grand Junction
[expand +]		 PAL Moderate 54 Ozone 56 PPB 8-hour 1 AM
Pueblo
[expand +]		 PWES Moderate 93 Ozone 68 PPB 8-hour 7 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 46 Ozone 50 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Moderate 58 Ozone 57 PPB 8-hour 7 PM
Steamboat Springs
[expand +]		 SSMB Good 22 Particulate < 2.5 micrometers 4 µg/m3 24-hour 1 AM
Other
[expand +]		 LMB Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 6 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Good 23 0.029 0.031 11 AM

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