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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 10/23/26 (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 +]		 NREL Good 46 Ozone 50 PPB 8-hour 5 PM
Ft. Collins - Greeley
[expand +]		 GRET Good 40 Ozone 43 PPB 8-hour 5 PM
Colorado Springs
[expand +]		 ACAD Good 38 Ozone 41 PPB 8-hour 5 PM
Grand Junction
[expand +]		 PAL Good 37 Ozone 40 PPB 8-hour 5 PM
Pueblo
[expand +]		 PWES Good 32 Ozone 35 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 34 Ozone 37 PPB 8-hour 5 PM
Four Corners
[expand +]		 CTZ Good 31 Ozone 33 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 8 Particulate < 2.5 micrometers 1 µg/m3 24-hour 5 PM
Aspen
[expand +]		 ASPN2 Good 5 Particulate < 10 micrometers 5 µg/m3 24-hour 5 PM
Other
[expand +]		 LMB Good 26 Particulate < 2.5 micrometers 4 µg/m3 24-hour 5 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 +]		 ADB Moderate 77 Particulate < 10 micrometers 107 µg/m3 24-hour 12 PM
Ft. Collins - Greeley
[expand +]		 GRET Good 40 Ozone 43 PPB 8-hour 5 PM
Colorado Springs
[expand +]		 ACAD Good 38 Ozone 41 PPB 8-hour 5 PM
Grand Junction
[expand +]		 PAL Good 37 Ozone 40 PPB 8-hour 5 PM
Pueblo
[expand +]		 PWES Good 32 Ozone 35 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 34 Ozone 37 PPB 8-hour 5 PM
Four Corners
[expand +]		 CTZ Good 31 Ozone 33 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 11 Particulate < 2.5 micrometers 1 µg/m3 24-hour 1 AM
Aspen
[expand +]		 ASPN2 Good 6 Particulate < 2.5 micrometers 1 µg/m3 24-hour 6 AM
Other
[expand +]		 LMB Good 26 Particulate < 2.5 micrometers 4 µg/m3 24-hour 5 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 56 0.053 0.058 3 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