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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 09/15/26 (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 45 Ozone 49 PPB 8-hour 2 PM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 51 Particulate < 2.5 micrometers 9 µg/m3 24-hour 2 PM
Colorado Springs
[expand +]		 ACAD Good 42 Ozone 45 PPB 8-hour 2 PM
Grand Junction
[expand +]		 PAL Good 31 Ozone 34 PPB 8-hour 2 PM
Pueblo
[expand +]		 PWES Good 36 Ozone 39 PPB 8-hour 2 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 24 Ozone 26 PPB 8-hour 2 PM
Four Corners
[expand +]		 CTZ Good 30 Ozone 32 PPB 8-hour 2 PM
Steamboat Springs
[expand +]		 SSMB Good 18 Particulate < 2.5 micrometers 3 µg/m3 24-hour 2 PM
Aspen
[expand +]		 ASPN2 Good 11 Particulate < 2.5 micrometers 1 µg/m3 24-hour 2 PM
Other
[expand +]		 DELT Good 22 Particulate < 2.5 micrometers 3 µg/m3 24-hour 2 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 53 Particulate < 10 micrometers 59 µg/m3 24-hour 3 AM
Ft. Collins - Greeley
[expand +]		 FTCF Moderate 51 Particulate < 2.5 micrometers 9 µg/m3 24-hour 1 PM
Colorado Springs
[expand +]		 ACAD Good 42 Ozone 45 PPB 8-hour 2 PM
Grand Junction
[expand +]		 PAL Good 32 Ozone 35 PPB 8-hour 1 AM
Pueblo
[expand +]		 PWES Good 36 Ozone 39 PPB 8-hour 2 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 24 Ozone 26 PPB 8-hour 1 AM
Four Corners
[expand +]		 CTZ Good 31 Ozone 33 PPB 8-hour 3 AM
Steamboat Springs
[expand +]		 SSMB Good 19 Particulate < 2.5 micrometers 3 µg/m3 24-hour 6 AM
Aspen
[expand +]		 ASPN2 Good 11 Particulate < 2.5 micrometers 1 µg/m3 24-hour 1 AM
Other
[expand +]		 DELT Good 22 Particulate < 2.5 micrometers 3 µg/m3 24-hour 11 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 110 0.083 0.080 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