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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 09/18/25 (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 32 Ozone 35 PPB 8-hour 9 AM
Ft. Collins - Greeley
[expand +]		 FTCW Good 27 Ozone 29 PPB 8-hour 9 AM
Colorado Springs
[expand +]		 MAN Good 29 Ozone 31 PPB 8-hour 9 AM
Grand Junction
[expand +]		 PAL Good 32 Ozone 35 PPB 8-hour 9 AM
Pueblo
[expand +]		 PWES Good 28 Ozone 30 PPB 8-hour 9 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 14 Ozone 15 PPB 8-hour 9 AM
Four Corners
[expand +]		 CTZ Good 22 Ozone 24 PPB 8-hour 9 AM
Steamboat Springs
[expand +]		 SSMB Good 15 Particulate < 2.5 micrometers 2 µg/m3 24-hour 9 AM
Aspen
[expand +]		 ASPN Good 24 Ozone 26 PPB 8-hour 9 AM
Other
[expand +]		 DELT Good 21 Particulate < 2.5 micrometers 3 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)

Daily Highs:

Area Site Air Quality Max AQI Pollutant Conc. Period Time *
(MST)
Denver METRO
[expand +]		 I25DEN Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 1 AM
Ft. Collins - Greeley
[expand +]		 TIM Good 40 Ozone 43 PPB 8-hour 1 AM
Colorado Springs
[expand +]		 MAN Good 37 Ozone 40 PPB 8-hour 1 AM
Grand Junction
[expand +]		 PAL Good 44 Ozone 47 PPB 8-hour 1 AM
Pueblo
[expand +]		 PWES Good 41 Ozone 44 PPB 8-hour 1 AM
Colorado River Valley
[expand +]		 RIFLO3 Good 31 Ozone 34 PPB 8-hour 1 AM
Four Corners
[expand +]		 CTZ Good 33 Ozone 36 PPB 8-hour 1 AM
Steamboat Springs
[expand +]		 SSMB Good 15 Particulate < 2.5 micrometers 2 µg/m3 24-hour 6 AM
Aspen
[expand +]		 ASPN Good 33 Ozone 36 PPB 8-hour 1 AM
Other
[expand +]		 DELT Good 24 Particulate < 2.5 micrometers 4 µg/m3 24-hour 5 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