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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 07/28/26 (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 +]		 HLD Moderate 87 Ozone 66 PPB 8-hour 3 PM
Ft. Collins - Greeley
[expand +]		 GRET Moderate 71 Ozone 61 PPB 8-hour 3 PM
Colorado Springs
[expand +]		 ACAD Moderate 84 Ozone 65 PPB 8-hour 3 PM
Grand Junction
[expand +]		 PAL Good 47 Ozone 51 PPB 8-hour 3 PM
Pueblo
[expand +]		 PWES Moderate 87 Ozone 66 PPB 8-hour 3 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 44 Ozone 47 PPB 8-hour 3 PM
Four Corners
[expand +]		 CTZ Good 44 Ozone 48 PPB 8-hour 3 PM
Steamboat Springs
[expand +]		 SSMB Good 23 Particulate < 2.5 micrometers 4 µg/m3 24-hour 3 PM
Aspen
[expand +]		 ASPN Good 39 Ozone 42 PPB 8-hour 3 PM
Other
[expand +]		 LMB Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 3 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 +]		 HLD Moderate 87 Ozone 66 PPB 8-hour 3 PM
Ft. Collins - Greeley
[expand +]		 GRET Moderate 71 Ozone 61 PPB 8-hour 3 PM
Colorado Springs
[expand +]		 ACAD Moderate 84 Ozone 65 PPB 8-hour 3 PM
Grand Junction
[expand +]		 PAL Good 47 Ozone 51 PPB 8-hour 3 PM
Pueblo
[expand +]		 PWES Moderate 87 Ozone 66 PPB 8-hour 3 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 44 Ozone 47 PPB 8-hour 3 PM
Four Corners
[expand +]		 CTZ Good 44 Ozone 48 PPB 8-hour 3 PM
Steamboat Springs
[expand +]		 SSMB Good 23 Particulate < 2.5 micrometers 4 µg/m3 24-hour 12 PM
Aspen
[expand +]		 ASPN Good 39 Ozone 42 PPB 8-hour 3 PM
Other
[expand +]		 LMB Good 41 Particulate < 2.5 micrometers 7 µg/m3 24-hour 2 PM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Poor 105 0.079 0.078 1 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