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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 02/04/25 (Today)

Air Quality Forecasts and Advisories & Colorado Smoke Outlook
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.		 Current Air Quality

Current Hour:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 I25DEN Moderate 68 Particulate < 2.5 micrometers 18 µg/m3 24-hour 11 PM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 60 Particulate < 2.5 micrometers 14 µg/m3 24-hour 11 PM
Colorado Springs
[expand +]		 CAN Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 11 PM
Grand Junction
[expand +]		 GJPB Good 42 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Pueblo
[expand +]		 PFS Good 38 Particulate < 2.5 micrometers 7 µg/m3 24-hour 11 PM
Colorado River Valley
[expand +]		 RIFL Good 43 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Four Corners
[expand +]		 CTZ Good 33 Ozone 36 PPB 8-hour 11 PM
Other
[expand +]		 PAG Good 35 Particulate < 2.5 micrometers 6 µg/m3 24-hour 11 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 I25DEN Moderate 68 Particulate < 2.5 micrometers 18 µg/m3 24-hour 11 PM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 60 Particulate < 2.5 micrometers 14 µg/m3 24-hour 10 PM
Colorado Springs
[expand +]		 CAN Moderate 52 Particulate < 2.5 micrometers 9 µg/m3 24-hour 11 PM
Grand Junction
[expand +]		 GJPB Moderate 55 Particulate < 2.5 micrometers 12 µg/m3 24-hour 2 AM
Pueblo
[expand +]		 PFS Good 38 Particulate < 2.5 micrometers 7 µg/m3 24-hour 11 PM
Colorado River Valley
[expand +]		 RIFL Good 43 Particulate < 2.5 micrometers 8 µg/m3 24-hour 11 PM
Four Corners
[expand +]		 CTZ Good 37 Ozone 40 PPB 8-hour 7 PM
Other
[expand +]		 PAG Good 43 Particulate < 2.5 micrometers 8 µg/m3 24-hour 2 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 184 0.138 0.135 4 PM

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

AQI health statements
Site information and abbreviations