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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 10/31/25 (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 Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 10 PM
Ft. Collins - Greeley
[expand +]		 PMS Good 43 Particulate < 2.5 micrometers 7 µg/m3 24-hour 10 PM
Colorado Springs
[expand +]		 MAN Good 34 Ozone 37 PPB 8-hour 10 PM
Grand Junction
[expand +]		 PAL Good 37 Ozone 40 PPB 8-hour 10 PM
Pueblo
[expand +]		 PWES Good 31 Ozone 33 PPB 8-hour 10 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 23 Ozone 25 PPB 8-hour 10 PM
Four Corners
[expand +]		 CTZ Good 30 Ozone 32 PPB 8-hour 10 PM
Steamboat Springs
[expand +]		 SSMB Good 16 Particulate < 2.5 micrometers 2 µg/m3 24-hour 10 PM
Aspen
[expand +]		 ASPN Good 36 Ozone 39 PPB 8-hour 10 PM
Other
[expand +]		 LMB Good 26 Particulate < 10 micrometers 28 µg/m3 24-hour 10 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 Good 49 Particulate < 2.5 micrometers 8 µg/m3 24-hour 10 PM
Ft. Collins - Greeley
[expand +]		 PMS Good 45 Particulate < 2.5 micrometers 8 µg/m3 24-hour 8 PM
Colorado Springs
[expand +]		 MAN Good 36 Ozone 39 PPB 8-hour 7 PM
Grand Junction
[expand +]		 PAL Good 39 Ozone 42 PPB 8-hour 7 PM
Pueblo
[expand +]		 PWES Good 36 Ozone 39 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 30 Ozone 32 PPB 8-hour 7 PM
Four Corners
[expand +]		 CTZ Good 33 Ozone 36 PPB 8-hour 7 PM
Steamboat Springs
[expand +]		 SSMB Good 16 Particulate < 2.5 micrometers 2 µg/m3 24-hour 2 PM
Aspen
[expand +]		 ASPN Good 41 Ozone 44 PPB 8-hour 8 PM
Other
[expand +]		 ALA Good 31 Particulate < 2.5 micrometers 5 µg/m3 24-hour 5 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 83 0.067 0.065 11 AM

* 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