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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 09/17/25 (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 +]		 RFN Good 45 Ozone 49 PPB 8-hour 12 PM
Ft. Collins - Greeley
[expand +]		 FTCW Good 31 Ozone 33 PPB 8-hour 12 PM
Colorado Springs
[expand +]		 MAN Good 36 Ozone 39 PPB 8-hour 12 PM
Grand Junction
[expand +]		 PAL Good 33 Ozone 36 PPB 8-hour 12 PM
Pueblo
[expand +]		 PWES Good 29 Ozone 31 PPB 8-hour 12 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 17 Ozone 18 PPB 8-hour 12 PM
Four Corners
[expand +]		 CTZ Good 27 Ozone 29 PPB 8-hour 12 PM
Steamboat Springs
[expand +]		 SSMB Good 16 Particulate < 2.5 micrometers 2 µg/m3 24-hour 12 PM
Aspen
[expand +]		 ASPN Good 26 Ozone 28 PPB 8-hour 12 PM
Other
[expand +]		 DELT Good 26 Particulate < 10 micrometers 28 µg/m3 24-hour 12 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
No valid VSI calculations found (12pm - 4pm)

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 RFN Good 45 Ozone 49 PPB 8-hour 12 PM
Ft. Collins - Greeley
[expand +]		 GRET Good 42 Ozone 45 PPB 8-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 39 Ozone 42 PPB 8-hour 1 AM
Grand Junction
[expand +]		 PAL Good 45 Ozone 49 PPB 8-hour 1 AM
Pueblo
[expand +]		 PWES Good 39 Ozone 42 PPB 8-hour 1 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 34 Ozone 37 PPB 8-hour 1 AM
Four Corners
[expand +]		 CTZ Good 27 Ozone 29 PPB 8-hour 1 AM
Steamboat Springs
[expand +]		 SSMB Good 19 Particulate < 2.5 micrometers 3 µg/m3 24-hour 1 AM
Aspen
[expand +]		 ASPN Good 31 Ozone 34 PPB 8-hour 1 AM
Other
[expand +]		 DELT Good 26 Particulate < 2.5 micrometers 4 µg/m3 24-hour 9 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
No valid VSI calculations found (12pm - 4pm)

* 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