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AQI Calculations on 05/31/2026 1:00AM - 3:00AM

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.
3:00 AM ACAD O3 8 Good 43 46 PPB
3:00 AM ACC PM10 24 Good 7 8 µg/m3
3:00 AM ACC PM2.5 24 Good 16 2 µg/m3
3:00 AM ADB PM10 24 Good 22 24 µg/m3
3:00 AM ADB PM2.5 24 Good 22 4 µg/m3
3:00 AM ALA PM10 24 Good 15 16 µg/m3
3:00 AM ALA PM2.5 24 Good 18 3 µg/m3
3:00 AM ASPN2 PM10 24 Good 7 8 µg/m3
3:00 AM ASPN2 PM2.5 24 Good 11 2 µg/m3
3:00 AM AURE O3 8 Good 48 52 PPB
3:00 AM BHWK O3 8 Moderate 51 55 PPB
3:00 AM BOU PM10 24 Good 8 9 µg/m3
3:00 AM BOU PM2.5 24 Good 13 2 µg/m3
3:00 AM BOUR O3 8 Good 46 50 PPB
3:00 AM CAMP NO2 1 Good 8 8 PPB
3:00 AM CAMP NO2 1 Good 8 8 PPB
3:00 AM CAMP O3 8 Good 42 45 PPB
3:00 AM CAMP PM10 24 Good 8 9 µg/m3
3:00 AM CAMP PM2.5 24 Good 19 3 µg/m3
3:00 AM CAMP SO2 1 Good 1 1 PPB
3:00 AM CAMP SO2 1 Good 1 1 PPB
3:00 AM CAN PM10 24 Good 9 10 µg/m3
3:00 AM CAN PM2.5 24 Good 12 2 µg/m3
3:00 AM CASA CO 8 Good 1 0.1 PPM
3:00 AM CASA NO2 1 Good 19 20 PPB
3:00 AM CASA O3 8 Good 40 43 PPB
3:00 AM CASA PM10 24 Good 13 14 µg/m3
3:00 AM CASA PM2.5 24 Good 20 3 µg/m3
3:00 AM CCOL PM10 24 Good 12 13 µg/m3
3:00 AM CCOL PM2.5 24 Good 14 2 µg/m3
3:00 AM CHAT O3 8 Good 44 47 PPB
3:00 AM CHAT PM10 24 Good 9 10 µg/m3
3:00 AM CHAT PM2.5 24 Good 16 2 µg/m3
3:00 AM CTZ O3 8 Good 37 40 PPB
3:00 AM DELT PM10 24 Good 9 10 µg/m3
3:00 AM DELT PM2.5 24 Good 13 2 µg/m3
3:00 AM DELT PM2.5 24 Good 13 2 µg/m3
3:00 AM EVG O3 8 Good 44 48 PPB
3:00 AM FOS NO2 1 Good 2 2 PPB
3:00 AM FOS O3 8 Good 39 42 PPB
3:00 AM FTC CO 8 Good 1 0.1 PPM
3:00 AM FTC O3 8 Good 44 48 PPB
3:00 AM FTCF PM10 24 Good 6 7 µg/m3
3:00 AM FTCF PM2.5 24 Good 12 2 µg/m3
3:00 AM FTCW O3 8 Good 43 46 PPB
3:00 AM GJPB PM10 24 Good 3 3 µg/m3
3:00 AM GJPB PM2.5 24 Good 11 1 µg/m3
3:00 AM GREH PM10 24 Good 7 8 µg/m3
3:00 AM GREH PM2.5 24 Good 20 3 µg/m3
3:00 AM GRET CO 8 Good 1 0.1 PPM
3:00 AM GRET O3 8 Good 36 39 PPB
3:00 AM HLD O3 8 Moderate 54 56 PPB
3:00 AM I25DEN CO 8 Good 3 0.3 PPM
3:00 AM I25DEN NO2 1 Good 18 19 PPB
3:00 AM I25DEN PM10 24 Good 15 16 µg/m3
3:00 AM I25DEN PM2.5 24 Good 22 3 µg/m3
3:00 AM I25GLO NO2 1 Good 27 29 PPB
3:00 AM I25GLO PM10 24 Good 19 20 µg/m3
3:00 AM I25GLO PM2.5 24 Good 22 3 µg/m3
3:00 AM LAST NO2 1 Good 6 6 PPB
3:00 AM LAST O3 8 Good 39 42 PPB
3:00 AM LMB PM10 24 Good 15 16 µg/m3
3:00 AM LMB PM2.5 24 Good 18 3 µg/m3
3:00 AM LNGM PM10 24 Good 11 12 µg/m3
3:00 AM LNGM PM2.5 24 Good 17 3 µg/m3
3:00 AM MAN O3 8 Good 50 54 PPB
3:00 AM MFP O3 8 Moderate 58 57 PPB
3:00 AM NJH PM10 24 Good 12 13 µg/m3
3:00 AM NJH PM2.5 24 Good 19 3 µg/m3
3:00 AM NREL O3 8 Good 48 52 PPB
3:00 AM PAG PM10 24 Good 12 13 µg/m3
3:00 AM PAG PM2.5 24 Good 15 2 µg/m3
3:00 AM PAL O3 8 Good 41 44 PPB
3:00 AM PFS PM10 24 Good 12 13 µg/m3
3:00 AM PFS PM2.5 24 Good 15 2 µg/m3
3:00 AM PMS PM2.5 24 Good 18 3 µg/m3
3:00 AM PWES O3 8 Good 47 51 PPB
3:00 AM RFN O3 8 Moderate 58 57 PPB
3:00 AM RIFLO3 O3 8 Good 34 37 PPB
3:00 AM SSMB PM10 24 Good 7 8 µg/m3
3:00 AM SSMB PM2.5 24 Good 14 2 µg/m3
3:00 AM TEL PM10 24 Good 7 8 µg/m3
3:00 AM TEL PM2.5 24 Good 12 2 µg/m3
3:00 AM TIM NO2 1 Good 3 3 PPB
3:00 AM TIM O3 8 Good 37 40 PPB
3:00 AM TIM PM10 24 Good 9 10 µg/m3
3:00 AM TIM PM2.5 24 Good 14 2 µg/m3
3:00 AM WBY NO2 1 Good 18 19 PPB
3:00 AM WBY NO2 1 Good 18 19 PPB
3:00 AM WBY O3 8 Good 46 50 PPB
3:00 AM WBY PM10 24 Good 17 18 µg/m3
3:00 AM WBY PM2.5 24 Good 18 3 µg/m3
2:00 AM ACAD O3 8 Good 46 50 PPB
2:00 AM ACC PM10 24 Good 7 8 µg/m3
2:00 AM ACC PM2.5 24 Good 16 2 µg/m3
2:00 AM ADB PM10 24 Good 22 24 µg/m3
2:00 AM ADB PM2.5 24 Good 23 4 µg/m3
2:00 AM ALA PM10 24 Good 15 16 µg/m3
2:00 AM ALA PM2.5 24 Good 18 3 µg/m3
2:00 AM ASPN2 PM10 24 Good 7 8 µg/m3
2:00 AM ASPN2 PM2.5 24 Good 11 2 µg/m3
2:00 AM AURE O3 8 Moderate 54 56 PPB
2:00 AM BHWK O3 8 Moderate 54 56 PPB
2:00 AM BOU PM10 24 Good 8 9 µg/m3
2:00 AM BOU PM2.5 24 Good 13 2 µg/m3
2:00 AM BOUR O3 8 Good 47 51 PPB
2:00 AM CAMP NO2 1 Good 22 23 PPB
2:00 AM CAMP NO2 1 Good 22 23 PPB
2:00 AM CAMP O3 8 Good 44 47 PPB
2:00 AM CAMP PM10 24 Good 8 9 µg/m3
2:00 AM CAMP PM2.5 24 Good 19 3 µg/m3
2:00 AM CAN PM10 24 Good 9 10 µg/m3
2:00 AM CAN PM2.5 24 Good 13 2 µg/m3
2:00 AM CASA CO 8 Good 1 0.1 PPM
2:00 AM CASA NO2 1 Good 12 13 PPB
2:00 AM CASA O3 8 Good 44 48 PPB
2:00 AM CASA PM10 24 Good 13 14 µg/m3
2:00 AM CASA PM2.5 24 Good 20 3 µg/m3
2:00 AM CCOL PM10 24 Good 12 13 µg/m3
2:00 AM CCOL PM2.5 24 Good 15 2 µg/m3
2:00 AM CHAT O3 8 Good 48 52 PPB
2:00 AM CHAT PM10 24 Good 10 11 µg/m3
2:00 AM CHAT PM2.5 24 Good 16 2 µg/m3
2:00 AM CTZ O3 8 Good 41 44 PPB
2:00 AM DELT PM10 24 Good 9 10 µg/m3
2:00 AM DELT PM2.5 24 Good 13 2 µg/m3
2:00 AM DELT PM2.5 24 Good 13 2 µg/m3
2:00 AM EVG O3 8 Good 48 52 PPB
2:00 AM FOS NO2 1 Good 3 3 PPB
2:00 AM FOS O3 8 Good 41 44 PPB
2:00 AM FTC CO 8 Good 1 0.1 PPM
2:00 AM FTC O3 8 Good 44 48 PPB
2:00 AM FTCF PM10 24 Good 6 7 µg/m3
2:00 AM FTCF PM2.5 24 Good 12 2 µg/m3
2:00 AM FTCW O3 8 Good 43 46 PPB
2:00 AM GJPB PM10 24 Good 3 3 µg/m3
2:00 AM GJPB PM2.5 24 Good 11 2 µg/m3
2:00 AM GREH PM10 24 Good 7 8 µg/m3
2:00 AM GREH PM2.5 24 Good 19 3 µg/m3
2:00 AM GRET CO 8 Good 1 0.1 PPM
2:00 AM GRET O3 8 Good 37 40 PPB
2:00 AM HLD O3 8 Moderate 61 58 PPB
2:00 AM I25DEN CO 8 Good 3 0.3 PPM
2:00 AM I25DEN NO2 1 Good 26 28 PPB
2:00 AM I25DEN PM10 24 Good 15 16 µg/m3
2:00 AM I25DEN PM2.5 24 Good 22 3 µg/m3
2:00 AM I25GLO NO2 1 Good 33 35 PPB
2:00 AM I25GLO PM10 24 Good 19 20 µg/m3
2:00 AM I25GLO PM2.5 24 Good 22 4 µg/m3
2:00 AM LAST NO2 1 Good 5 5 PPB
2:00 AM LAST O3 8 Good 41 44 PPB
2:00 AM LMB PM10 24 Good 15 16 µg/m3
2:00 AM LMB PM2.5 24 Good 18 3 µg/m3
2:00 AM LNGM PM10 24 Good 11 12 µg/m3
2:00 AM LNGM PM2.5 24 Good 17 3 µg/m3
2:00 AM MAN O3 8 Moderate 54 56 PPB
2:00 AM MFP O3 8 Moderate 54 56 PPB
2:00 AM NJH PM10 24 Good 12 13 µg/m3
2:00 AM NJH PM2.5 24 Good 19 3 µg/m3
2:00 AM NREL O3 8 Good 50 54 PPB
2:00 AM PAG PM10 24 Good 13 14 µg/m3
2:00 AM PAG PM2.5 24 Good 16 2 µg/m3
2:00 AM PAL O3 8 Good 44 47 PPB
2:00 AM PFS PM10 24 Good 12 13 µg/m3
2:00 AM PFS PM2.5 24 Good 15 2 µg/m3
2:00 AM PMS PM2.5 24 Good 18 3 µg/m3
2:00 AM PWES O3 8 Good 50 54 PPB
2:00 AM RFN O3 8 Moderate 58 57 PPB
2:00 AM RIFLO3 O3 8 Good 37 40 PPB
2:00 AM SSMB PM10 24 Good 8 9 µg/m3
2:00 AM SSMB PM2.5 24 Good 14 2 µg/m3
2:00 AM TEL PM10 24 Good 7 8 µg/m3
2:00 AM TEL PM2.5 24 Good 12 2 µg/m3
2:00 AM TIM NO2 1 Good 1 1 PPB
2:00 AM TIM O3 8 Good 40 43 PPB
2:00 AM TIM PM10 24 Good 9 10 µg/m3
2:00 AM TIM PM2.5 24 Good 14 2 µg/m3
2:00 AM WBY NO2 1 Good 8 8 PPB
2:00 AM WBY NO2 1 Good 8 8 PPB
2:00 AM WBY O3 8 Moderate 54 56 PPB
2:00 AM WBY PM10 24 Good 17 18 µg/m3
2:00 AM WBY PM2.5 24 Good 19 3 µg/m3
1:00 AM ACAD O3 8 Good 50 54 PPB
1:00 AM ACC PM10 24 Good 7 8 µg/m3
1:00 AM ACC PM2.5 24 Good 16 2 µg/m3
1:00 AM ADB PM10 24 Good 23 25 µg/m3
1:00 AM ADB PM2.5 24 Good 23 4 µg/m3
1:00 AM ALA PM10 24 Good 16 17 µg/m3
1:00 AM ALA PM2.5 24 Good 18 3 µg/m3
1:00 AM ASPN2 PM10 24 Good 8 9 µg/m3
1:00 AM ASPN2 PM2.5 24 Good 12 2 µg/m3
1:00 AM AURE O3 8 Moderate 64 59 PPB
1:00 AM BHWK O3 8 Moderate 58 57 PPB
1:00 AM BOU PM10 24 Good 8 9 µg/m3
1:00 AM BOU PM2.5 24 Good 14 2 µg/m3
1:00 AM BOUR O3 8 Good 50 54 PPB
1:00 AM CAMP NO2 1 Good 16 17 PPB
1:00 AM CAMP NO2 1 Good 16 17 PPB
1:00 AM CAMP O3 8 Good 49 53 PPB
1:00 AM CAMP PM10 24 Good 8 9 µg/m3
1:00 AM CAMP PM2.5 24 Good 19 3 µg/m3
1:00 AM CAN PM10 24 Good 10 11 µg/m3
1:00 AM CAN PM2.5 24 Good 13 2 µg/m3
1:00 AM CASA CO 8 Good 1 0.1 PPM
1:00 AM CASA NO2 1 Good 8 9 PPB
1:00 AM CASA O3 8 Good 49 53 PPB
1:00 AM CASA PM10 24 Good 13 14 µg/m3
1:00 AM CASA PM2.5 24 Good 20 3 µg/m3
1:00 AM CCOL PM10 24 Good 12 13 µg/m3
1:00 AM CCOL PM2.5 24 Good 15 2 µg/m3
1:00 AM CHAT O3 8 Moderate 54 56 PPB
1:00 AM CHAT PM10 24 Good 10 11 µg/m3
1:00 AM CHAT PM2.5 24 Good 17 3 µg/m3
1:00 AM CTZ O3 8 Good 44 48 PPB
1:00 AM DELT PM10 24 Good 9 10 µg/m3
1:00 AM DELT PM2.5 24 Good 13 2 µg/m3
1:00 AM DELT PM2.5 24 Good 13 2 µg/m3
1:00 AM EVG O3 8 Moderate 58 57 PPB
1:00 AM FOS NO2 1 Good 3 3 PPB
1:00 AM FOS O3 8 Good 43 46 PPB
1:00 AM FTC CO 8 Good 1 0.1 PPM
1:00 AM FTC O3 8 Good 44 48 PPB
1:00 AM FTCF PM10 24 Good 6 7 µg/m3
1:00 AM FTCF PM2.5 24 Good 13 2 µg/m3
1:00 AM FTCW O3 8 Good 43 46 PPB
1:00 AM GJPB PM10 24 Good 3 3 µg/m3
1:00 AM GJPB PM2.5 24 Good 11 2 µg/m3
1:00 AM GREH PM10 24 Good 7 8 µg/m3
1:00 AM GREH PM2.5 24 Good 18 3 µg/m3
1:00 AM GRET CO 8 Good 1 0.1 PPM
1:00 AM GRET O3 8 Good 39 42 PPB
1:00 AM HLD O3 8 Moderate 71 61 PPB
1:00 AM I25DEN CO 8 Good 3 0.3 PPM
1:00 AM I25DEN NO2 1 Good 29 31 PPB
1:00 AM I25DEN PM10 24 Good 15 16 µg/m3
1:00 AM I25DEN PM2.5 24 Good 22 3 µg/m3
1:00 AM I25GLO NO2 1 Good 23 24 PPB
1:00 AM I25GLO PM10 24 Good 19 20 µg/m3
1:00 AM I25GLO PM2.5 24 Good 22 4 µg/m3
1:00 AM LAST NO2 1 Good 4 4 PPB
1:00 AM LAST O3 8 Good 43 46 PPB
1:00 AM LMB PM10 24 Good 15 16 µg/m3
1:00 AM LMB PM2.5 24 Good 18 3 µg/m3
1:00 AM LNGM PM10 24 Good 11 12 µg/m3
1:00 AM LNGM PM2.5 24 Good 18 3 µg/m3
1:00 AM MAN O3 8 Moderate 61 58 PPB
1:00 AM MFP O3 8 Moderate 54 56 PPB
1:00 AM NJH PM10 24 Good 12 13 µg/m3
1:00 AM NJH PM2.5 24 Good 19 3 µg/m3
1:00 AM NREL O3 8 Moderate 54 56 PPB
1:00 AM PAG PM10 24 Good 14 15 µg/m3
1:00 AM PAG PM2.5 24 Good 16 2 µg/m3
1:00 AM PAL O3 8 Good 46 50 PPB
1:00 AM PFS PM10 24 Good 12 13 µg/m3
1:00 AM PFS PM2.5 24 Good 16 2 µg/m3
1:00 AM PMS PM2.5 24 Good 18 3 µg/m3
1:00 AM PWES O3 8 Moderate 58 57 PPB
1:00 AM RFN O3 8 Moderate 61 58 PPB
1:00 AM RIFLO3 O3 8 Good 40 43 PPB
1:00 AM SSMB PM10 24 Good 8 9 µg/m3
1:00 AM SSMB PM2.5 24 Good 15 2 µg/m3
1:00 AM TEL PM10 24 Good 8 9 µg/m3
1:00 AM TEL PM2.5 24 Good 12 2 µg/m3
1:00 AM TIM NO2 1 Good 1 1 PPB
1:00 AM TIM O3 8 Good 43 46 PPB
1:00 AM TIM PM10 24 Good 9 10 µg/m3
1:00 AM TIM PM2.5 24 Good 15 2 µg/m3
1:00 AM WBY NO2 1 Good 4 4 PPB
1:00 AM WBY NO2 1 Good 4 4 PPB
1:00 AM WBY O3 8 Moderate 64 59 PPB
1:00 AM WBY PM10 24 Good 18 19 µg/m3
1:00 AM WBY PM2.5 24 Good 19 3 µg/m3

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