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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 08/18/26 (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 Unhealthy for Sensitive Groups 118 Ozone 76 PPB 8-hour 6 PM
Ft. Collins - Greeley
[expand +]		 FOS Moderate 77 Ozone 63 PPB 8-hour 6 PM
Colorado Springs
[expand +]		 MAN Moderate 64 Ozone 59 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Good 45 Ozone 49 PPB 8-hour 6 PM
Pueblo
[expand +]		 PWES Good 50 Ozone 54 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 41 Ozone 44 PPB 8-hour 6 PM
Four Corners
[expand +]		 CTZ Good 47 Ozone 51 PPB 8-hour 6 PM
Steamboat Springs
[expand +]		 SSMB Good 16 Particulate < 2.5 micrometers 2 µg/m3 24-hour 6 PM
Aspen
[expand +]		 ASPN Good 39 Ozone 42 PPB 8-hour 6 PM
Other
[expand +]		 LMB Good 38 Particulate < 2.5 micrometers 6 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 +]		 NREL Unhealthy for Sensitive Groups 118 Ozone 76 PPB 8-hour 6 PM
Ft. Collins - Greeley
[expand +]		 FOS Moderate 77 Ozone 63 PPB 8-hour 5 PM
Colorado Springs
[expand +]		 MAN Moderate 64 Ozone 59 PPB 8-hour 6 PM
Grand Junction
[expand +]		 PAL Good 45 Ozone 49 PPB 8-hour 5 PM
Pueblo
[expand +]		 PWES Good 50 Ozone 54 PPB 8-hour 6 PM
Colorado River Valley
[expand +]		 RIFLO3 Good 42 Ozone 45 PPB 8-hour 5 PM
Four Corners
[expand +]		 CTZ Good 47 Ozone 51 PPB 8-hour 5 PM
Steamboat Springs
[expand +]		 SSMB Good 16 Particulate < 2.5 micrometers 2 µg/m3 24-hour 9 AM
Aspen
[expand +]		 ASPN Good 41 Ozone 44 PPB 8-hour 1 AM
Other
[expand +]		 LMB Good 39 Particulate < 2.5 micrometers 7 µg/m3 24-hour 9 AM

Area Site Visibility Max VSI 4-hour Average
(1/km)
 Beta Extinction
(1/km)
 Time *
(MST)
Denver DES Moderate 52 0.052 0.044 2 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