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 07/17/25

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 +]		 RFN Moderate 100 Ozone 70 PPB 8-hour 7 PM
Ft. Collins - Greeley
[expand +]		 TIM Moderate 84 Ozone 65 PPB 8-hour 10 PM
Colorado Springs
[expand +]		 MAN Good 46 Ozone 50 PPB 8-hour 5 PM
Grand Junction
[expand +]		 GJPB Moderate 85 Particulate < 2.5 micrometers 27 µg/m3 24-hour 1 AM
Pueblo
[expand +]		 CAN Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 5 AM
Colorado River Valley
[expand +]		 RIFL Moderate 64 Particulate < 2.5 micrometers 16 µg/m3 24-hour 11 PM
Four Corners
[expand +]		 PAG Moderate 64 Particulate < 2.5 micrometers 16 µg/m3 24-hour 1 AM
Steamboat Springs
[expand +]		 SSMB Moderate 51 Particulate < 2.5 micrometers 9 µg/m3 24-hour 12 AM
Aspen
[expand +]		 ASPN2 Moderate 77 Particulate < 2.5 micrometers 22 µg/m3 24-hour 1 AM
Other
[expand +]		 DELT Unhealthy for Sensitive Groups 103 Particulate < 2.5 micrometers 36 µg/m3 24-hour 1 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Ext Poor 203 0.169 0.150 2 PM

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