Colorado
Translate
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.

AQI Calculations on 01/23/2026 1:00AM - 2:00AM

The EPA (Environmental Protection Agency) developed the AQI (Air Quality Index) to make reading ambient air data more understandable to the general public. When ambient air data is collected, the numbers are converted from their concentration levels into numbers on a scale. That scale is the pollutant's AQI value. (Click here for a more detailed description of the AQI scale). Below is a list of all of the latest AQI values collected.


Due to limited system resources and high volume, today's AQI calculations can no longer be sorted by columns. For a CSV file of these data, updated hourly, click here.


All data are collected real-time and have not been corrected nor validated.

Time *
(MST)
 Monitoring Location Pollutant Interval
(Hr)
 Air Quality AQI Avg.
2:00 AM ACAD O3 8 Good 29 31 PPB
2:00 AM ACC PM10 24 Good 14 15 µg/m3
2:00 AM ACC PM2.5 24 Good 28 5 µg/m3
2:00 AM ADB PM10 24 Good 31 34 µg/m3
2:00 AM ADB PM2.5 24 Good 32 5 µg/m3
2:00 AM ALA PM10 24 Good 28 30 µg/m3
2:00 AM ALA PM2.5 24 Good 46 8 µg/m3
2:00 AM ASPN O3 8 Good 28 30 PPB
2:00 AM ASPN2 PM10 24 Good 44 47 µg/m3
2:00 AM ASPN2 PM2.5 24 Good 37 6 µg/m3
2:00 AM AURE O3 8 Good 28 30 PPB
2:00 AM BHWK O3 8 Good 24 26 PPB
2:00 AM BOU PM10 24 Good 16 17 µg/m3
2:00 AM BOU PM2.5 24 Good 22 4 µg/m3
2:00 AM BOUR O3 8 Good 23 25 PPB
2:00 AM CAMP NO2 1 Good 14 15 PPB
2:00 AM CAMP NO2 1 Good 14 15 PPB
2:00 AM CAMP O3 8 Good 10 11 PPB
2:00 AM CAMP PM10 24 Good 17 18 µg/m3
2:00 AM CAMP PM2.5 24 Good 32 5 µg/m3
2:00 AM CAN PM10 24 Good 22 24 µg/m3
2:00 AM CAN PM2.5 24 Good 31 5 µg/m3
2:00 AM CASA CO 8 Good 2 0.2 PPM
2:00 AM CASA NO2 1 Good 7 7 PPB
2:00 AM CASA O3 8 Good 12 13 PPB
2:00 AM CASA PM10 24 Good 19 20 µg/m3
2:00 AM CASA PM2.5 24 Good 24 4 µg/m3
2:00 AM CCOL PM10 24 Good 18 19 µg/m3
2:00 AM CCOL PM2.5 24 Good 18 3 µg/m3
2:00 AM CHAT O3 8 Good 20 22 PPB
2:00 AM CHAT PM10 24 Good 18 19 µg/m3
2:00 AM CHAT PM2.5 24 Good 29 5 µg/m3
2:00 AM CTZ O3 8 Good 8 9 PPB
2:00 AM DELT PM10 24 Good 38 41 µg/m3
2:00 AM DELT PM2.5 24 Moderate 63 15 µg/m3
2:00 AM DELT PM2.5 24 Moderate 63 15 µg/m3
2:00 AM EVG O3 8 Good 20 22 PPB
2:00 AM FOS NO2 1 Good 1 1 PPB
2:00 AM FOS O3 8 Good 28 30 PPB
2:00 AM FTC CO 8 Good 1 0.1 PPM
2:00 AM FTC O3 8 Good 28 30 PPB
2:00 AM FTCF PM10 24 Good 17 18 µg/m3
2:00 AM FTCF PM2.5 24 Good 27 4 µg/m3
2:00 AM FTCW O3 8 Good 31 33 PPB
2:00 AM GJPB PM10 24 Good 28 30 µg/m3
2:00 AM GJPB PM2.5 24 Moderate 55 11 µg/m3
2:00 AM GREH PM10 24 Good 13 14 µg/m3
2:00 AM GREH PM2.5 24 Good 21 3 µg/m3
2:00 AM GRET CO 8 Good 1 0.1 PPM
2:00 AM GRET O3 8 Good 29 31 PPB
2:00 AM HLD O3 8 Good 15 16 PPB
2:00 AM I25DEN CO 8 Good 3 0.3 PPM
2:00 AM I25DEN NO2 1 Good 9 10 PPB
2:00 AM I25DEN PM10 24 Good 19 20 µg/m3
2:00 AM I25DEN PM2.5 24 Good 34 6 µg/m3
2:00 AM I25GLO NO2 1 Good 11 12 PPB
2:00 AM I25GLO PM10 24 Good 23 25 µg/m3
2:00 AM I25GLO PM2.5 24 Good 34 6 µg/m3
2:00 AM LAST NO2 1 Good 2 2 PPB
2:00 AM LAST O3 8 Good 29 31 PPB
2:00 AM LMB PM10 24 Good 16 17 µg/m3
2:00 AM LMB PM2.5 24 Good 20 3 µg/m3
2:00 AM LNGM PM10 24 Good 19 20 µg/m3
2:00 AM LNGM PM2.5 24 Good 28 5 µg/m3
2:00 AM MAN O3 8 Good 30 32 PPB
2:00 AM MFP NO2 1 Good 2 2 PPB
2:00 AM MFP O3 8 Good 30 32 PPB
2:00 AM NJH PM10 24 Good 19 20 µg/m3
2:00 AM NJH PM2.5 24 Good 26 4 µg/m3
2:00 AM NREL O3 8 Good 28 30 PPB
2:00 AM PAG PM10 24 Good 33 36 µg/m3
2:00 AM PAG PM2.5 24 Good 34 6 µg/m3
2:00 AM PAL O3 8 Good 22 24 PPB
2:00 AM PFS PM10 24 Good 19 21 µg/m3
2:00 AM PFS PM2.5 24 Good 29 5 µg/m3
2:00 AM PMS PM2.5 24 Good 33 5 µg/m3
2:00 AM PWES O3 8 Good 25 27 PPB
2:00 AM RFN NO2 1 Good 2 2 PPB
2:00 AM RFN O3 8 Good 30 32 PPB
2:00 AM RIFL PM2.5 24 Good 17 3 µg/m3
2:00 AM RIFLO3 O3 8 Good 3 3 PPB
2:00 AM SSMB PM10 24 Good 27 29 µg/m3
2:00 AM SSMB PM2.5 24 Good 34 6 µg/m3
2:00 AM TEL PM10 24 Good 24 26 µg/m3
2:00 AM TEL PM2.5 24 Good 19 3 µg/m3
2:00 AM TIM O3 8 Good 28 30 PPB
2:00 AM TIM PM10 24 Good 14 15 µg/m3
2:00 AM TIM PM2.5 24 Good 19 3 µg/m3
2:00 AM WBY NO2 1 Good 6 6 PPB
2:00 AM WBY NO2 1 Good 6 6 PPB
2:00 AM WBY O3 8 Good 18 19 PPB
2:00 AM WBY PM10 24 Good 19 21 µg/m3
2:00 AM WBY PM2.5 24 Good 24 4 µg/m3
1:00 AM ACAD O3 8 Good 29 31 PPB
1:00 AM ACC PM10 24 Good 14 15 µg/m3
1:00 AM ACC PM2.5 24 Good 27 4 µg/m3
1:00 AM ADB PM10 24 Good 31 34 µg/m3
1:00 AM ADB PM2.5 24 Good 32 5 µg/m3
1:00 AM ALA PM10 24 Good 28 30 µg/m3
1:00 AM ALA PM2.5 24 Good 47 8 µg/m3
1:00 AM ASPN O3 8 Good 27 29 PPB
1:00 AM ASPN2 PM10 24 Good 44 47 µg/m3
1:00 AM ASPN2 PM2.5 24 Good 37 6 µg/m3
1:00 AM AURE O3 8 Good 29 31 PPB
1:00 AM BHWK O3 8 Good 25 27 PPB
1:00 AM BOU PM10 24 Good 16 17 µg/m3
1:00 AM BOU PM2.5 24 Good 22 4 µg/m3
1:00 AM BOUR O3 8 Good 22 24 PPB
1:00 AM CAMP NO2 1 Good 23 24 PPB
1:00 AM CAMP NO2 1 Good 23 24 PPB
1:00 AM CAMP O3 8 Good 11 12 PPB
1:00 AM CAMP PM10 24 Good 17 18 µg/m3
1:00 AM CAMP PM2.5 24 Good 32 5 µg/m3
1:00 AM CAN PM10 24 Good 21 23 µg/m3
1:00 AM CAN PM2.5 24 Good 30 5 µg/m3
1:00 AM CASA CO 8 Good 2 0.2 PPM
1:00 AM CASA NO2 1 Good 11 12 PPB
1:00 AM CASA O3 8 Good 12 13 PPB
1:00 AM CASA PM10 24 Good 19 20 µg/m3
1:00 AM CASA PM2.5 24 Good 24 4 µg/m3
1:00 AM CCOL PM10 24 Good 18 19 µg/m3
1:00 AM CCOL PM2.5 24 Good 19 3 µg/m3
1:00 AM CHAT O3 8 Good 21 23 PPB
1:00 AM CHAT PM10 24 Good 17 18 µg/m3
1:00 AM CHAT PM2.5 24 Good 29 5 µg/m3
1:00 AM CTZ O3 8 Good 9 10 PPB
1:00 AM DELT PM10 24 Good 38 41 µg/m3
1:00 AM DELT PM2.5 24 Moderate 63 15 µg/m3
1:00 AM DELT PM2.5 24 Moderate 63 15 µg/m3
1:00 AM EVG O3 8 Good 21 23 PPB
1:00 AM FOS NO2 1 Good 2 2 PPB
1:00 AM FOS O3 8 Good 28 30 PPB
1:00 AM FTC CO 8 Good 1 0.1 PPM
1:00 AM FTC O3 8 Good 27 29 PPB
1:00 AM FTCF PM10 24 Good 17 18 µg/m3
1:00 AM FTCF PM2.5 24 Good 27 4 µg/m3
1:00 AM FTCW O3 8 Good 31 33 PPB
1:00 AM GJPB PM10 24 Good 28 30 µg/m3
1:00 AM GJPB PM2.5 24 Moderate 55 11 µg/m3
1:00 AM GREH PM10 24 Good 13 14 µg/m3
1:00 AM GREH PM2.5 24 Good 21 3 µg/m3
1:00 AM GRET CO 8 Good 1 0.1 PPM
1:00 AM GRET O3 8 Good 29 31 PPB
1:00 AM HLD O3 8 Good 16 17 PPB
1:00 AM I25DEN CO 8 Good 3 0.3 PPM
1:00 AM I25DEN NO2 1 Good 15 16 PPB
1:00 AM I25DEN PM10 24 Good 19 20 µg/m3
1:00 AM I25DEN PM2.5 24 Good 34 6 µg/m3
1:00 AM I25GLO NO2 1 Good 19 20 PPB
1:00 AM I25GLO PM10 24 Good 23 25 µg/m3
1:00 AM I25GLO PM2.5 24 Good 35 6 µg/m3
1:00 AM LAST NO2 1 Good 2 2 PPB
1:00 AM LAST O3 8 Good 30 32 PPB
1:00 AM LMB PM10 24 Good 16 17 µg/m3
1:00 AM LMB PM2.5 24 Good 20 3 µg/m3
1:00 AM LNGM PM10 24 Good 19 20 µg/m3
1:00 AM LNGM PM2.5 24 Good 28 5 µg/m3
1:00 AM MAN O3 8 Good 31 33 PPB
1:00 AM MFP NO2 1 Good 2 2 PPB
1:00 AM MFP O3 8 Good 30 32 PPB
1:00 AM NJH PM10 24 Good 19 20 µg/m3
1:00 AM NJH PM2.5 24 Good 26 4 µg/m3
1:00 AM NREL O3 8 Good 28 30 PPB
1:00 AM PAG PM10 24 Good 33 36 µg/m3
1:00 AM PAG PM2.5 24 Good 33 6 µg/m3
1:00 AM PAL O3 8 Good 23 25 PPB
1:00 AM PFS PM10 24 Good 19 21 µg/m3
1:00 AM PFS PM2.5 24 Good 29 5 µg/m3
1:00 AM PMS PM2.5 24 Good 32 5 µg/m3
1:00 AM PWES O3 8 Good 25 27 PPB
1:00 AM RFN NO2 1 Good 4 4 PPB
1:00 AM RFN O3 8 Good 30 32 PPB
1:00 AM RIFL PM2.5 24 Good 16 2 µg/m3
1:00 AM RIFLO3 O3 8 Good 4 4 PPB
1:00 AM SSMB PM10 24 Good 27 29 µg/m3
1:00 AM SSMB PM2.5 24 Good 34 6 µg/m3
1:00 AM TEL PM10 24 Good 24 26 µg/m3
1:00 AM TEL PM2.5 24 Good 20 3 µg/m3
1:00 AM TIM NO2 1 Good 2 2 PPB
1:00 AM TIM O3 8 Good 29 31 PPB
1:00 AM TIM PM10 24 Good 14 15 µg/m3
1:00 AM TIM PM2.5 24 Good 19 3 µg/m3
1:00 AM WBY NO2 1 Good 10 11 PPB
1:00 AM WBY NO2 1 Good 10 11 PPB
1:00 AM WBY O3 8 Good 19 20 PPB
1:00 AM WBY PM10 24 Good 19 21 µg/m3
1:00 AM WBY PM2.5 24 Good 24 4 µg/m3

* All data are reported in Mountain Standard Time (MST). During daylight savings time add one hour to the reported hour.