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Detailed Air Quality Summary for 07/31/21 (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
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NREL Moderate 54 Ozone 56 PPB 8-hour 7 AM
Ft. Collins - Greeley
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GREH Good 49 Particulate < 2.5 micrometers 12 µg/m3 24-hour 7 AM
Colorado Springs
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ACAD Moderate 61 Ozone 58 PPB 8-hour 7 AM
Grand Junction
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PAL Good 44 Ozone 47 PPB 8-hour 7 AM
Colorado River Valley
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RIFLO3 Good 31 Ozone 33 PPB 8-hour 7 AM
Four Corners
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CTZ Good 30 Ozone 32 PPB 8-hour 7 AM
Other
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ASPN2 Good 23 Particulate < 2.5 micrometers 6 µg/m3 24-hour 7 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
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NREL Moderate 87 Ozone 66 PPB 8-hour 1 AM
Ft. Collins - Greeley
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GRET Moderate 67 Ozone 60 PPB 8-hour 1 AM
Colorado Springs
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MAN Moderate 87 Ozone 66 PPB 8-hour 1 AM
Grand Junction
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PAL Good 49 Ozone 53 PPB 8-hour 1 AM
Colorado River Valley
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RIFLO3 Good 44 Ozone 48 PPB 8-hour 1 AM
Four Corners
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CTZ Moderate 54 Ozone 56 PPB 8-hour 1 AM
Other
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ASPN2 Good 30 Particulate < 2.5 micrometers 7 µg/m3 24-hour 1 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.