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 06/04/25

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 +]		 I25GLO Moderate 54 Particulate < 2.5 micrometers 10 µg/m3 24-hour 7 PM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 8 PM
Colorado Springs
[expand +]		 MAN Good 37 Ozone 40 PPB 8-hour 5 AM
Grand Junction
[expand +]		 PAL Moderate 54 Ozone 56 PPB 8-hour 1 AM
Pueblo
[expand +]		 PFS Moderate 51 Particulate < 2.5 micrometers 9 µg/m3 24-hour 7 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 43 Ozone 46 PPB 8-hour 6 PM
Four Corners
[expand +]		 CTZ Good 45 Ozone 49 PPB 8-hour 8 PM
Steamboat Springs
[expand +]		 SSMB Good 20 Particulate < 2.5 micrometers 3 µg/m3 24-hour 1 AM
Other
[expand +]		 LMB Moderate 58 Particulate < 2.5 micrometers 13 µg/m3 24-hour 12 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 101 0.076 0.082 3 PM

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