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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 11/01/25 (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 50 Particulate < 2.5 micrometers 9 µg/m3 24-hour 6 PM
Ft. Collins - Greeley
[expand +]		 PMS Good 45 Particulate < 2.5 micrometers 8 µg/m3 24-hour 6 PM
Colorado Springs
[expand +]		 ACAD Good 41 Ozone 44 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Good 37 Ozone 40 PPB 8-hour 6 PM
Pueblo
[expand +]		 PWES Good 34 Ozone 37 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFL Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 6 PM
Four Corners
[expand +]		 CTZ Good 39 Ozone 42 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 17 Particulate < 2.5 micrometers 3 µg/m3 24-hour 6 PM
Aspen
[expand +]		 ASPN Good 37 Ozone 40 PPB 8-hour 6 PM
Other
[expand +]		 DELT Good 23 Particulate < 2.5 micrometers 4 µg/m3 24-hour 6 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 Moderate 53 Particulate < 2.5 micrometers 10 µg/m3 24-hour 12 PM
Ft. Collins - Greeley
[expand +]		 PMS Good 47 Particulate < 2.5 micrometers 8 µg/m3 24-hour 2 PM
Colorado Springs
[expand +]		 ACAD Good 41 Ozone 44 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Good 37 Ozone 40 PPB 8-hour 6 PM
Pueblo
[expand +]		 PWES Good 35 Ozone 38 PPB 8-hour 5 PM
Colorado River Valley
[expand +]		 RIFL Good 28 Particulate < 2.5 micrometers 5 µg/m3 24-hour 5 PM
Four Corners
[expand +]		 CTZ Good 39 Ozone 42 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 18 Particulate < 2.5 micrometers 3 µg/m3 24-hour 1 PM
Aspen
[expand +]		 ASPN Good 38 Ozone 41 PPB 8-hour 5 PM
Other
[expand +]		 LMB Good 25 Particulate < 10 micrometers 27 µg/m3 24-hour 1 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 77 0.064 0.063 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