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AQI Calculations on 10/20/2017 1:00AM - 5:00AM

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.

Click on the column headings to sort data.

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

Time *
(MST)
Monitoring Location Pollutant Interval
(Hr)
Air Quality AQI Avg.
5:00 AM GREH PM2.5 24 Moderate 71 22 µg/m3
4:00 AM GREH PM2.5 24 Moderate 71 22 µg/m3
3:00 AM GREH PM2.5 24 Moderate 71 22 µg/m3
2:00 AM GREH PM2.5 24 Moderate 71 22 µg/m3
1:00 AM GREH PM2.5 24 Moderate 71 21 µg/m3
5:00 AM I25GLO PM2.5 24 Moderate 60 17 µg/m3
4:00 AM I25GLO PM10 24 Moderate 60 73 µg/m3
4:00 AM I25GLO PM2.5 24 Moderate 60 17 µg/m3
3:00 AM I25GLO PM10 24 Moderate 60 73 µg/m3
3:00 AM I25GLO PM2.5 24 Moderate 60 17 µg/m3
2:00 AM I25GLO PM10 24 Moderate 60 73 µg/m3
2:00 AM I25GLO PM2.5 24 Moderate 60 17 µg/m3
1:00 AM I25GLO PM10 24 Moderate 60 73 µg/m3
1:00 AM I25GLO PM2.5 24 Moderate 60 16 µg/m3
5:00 AM I25GLO PM10 24 Moderate 59 72 µg/m3
4:00 AM CAMP PM2.5 24 Moderate 57 15 µg/m3
3:00 AM CAMP PM2.5 24 Moderate 57 15 µg/m3
3:00 AM GREH PM10 24 Moderate 57 67 µg/m3
2:00 AM CAMP PM2.5 24 Moderate 57 15 µg/m3
5:00 AM CAMP PM2.5 24 Moderate 56 15 µg/m3
5:00 AM GREH PM10 24 Moderate 56 66 µg/m3
5:00 AM I25DEN PM2.5 24 Moderate 56 15 µg/m3
4:00 AM GREH PM10 24 Moderate 56 66 µg/m3
4:00 AM I25DEN PM2.5 24 Moderate 56 14 µg/m3
3:00 AM I25DEN PM2.5 24 Moderate 56 14 µg/m3
2:00 AM GREH PM10 24 Moderate 56 66 µg/m3
1:00 AM CAMP PM2.5 24 Moderate 56 15 µg/m3
1:00 AM GREH PM10 24 Moderate 56 66 µg/m3
2:00 AM I25DEN PM2.5 24 Moderate 55 14 µg/m3
1:00 AM I25DEN PM2.5 24 Moderate 55 14 µg/m3
5:00 AM FTCF PM2.5 24 Moderate 54 14 µg/m3
4:00 AM FTCF PM2.5 24 Moderate 54 14 µg/m3
3:00 AM FTCF PM2.5 24 Moderate 54 14 µg/m3
2:00 AM FTCF PM2.5 24 Moderate 53 13 µg/m3
1:00 AM FTCF PM2.5 24 Moderate 53 13 µg/m3
4:00 AM FTCF PM10 24 Moderate 51 56 µg/m3
3:00 AM FTCF PM10 24 Moderate 51 56 µg/m3
2:00 AM FTCF PM10 24 Moderate 51 55 µg/m3
1:00 AM FTCF PM10 24 Moderate 51 55 µg/m3
5:00 AM FTCF PM10 24 Good 50 54 µg/m3
5:00 AM I25DEN PM10 24 Good 50 54 µg/m3
5:00 AM CASA PM2.5 24 Good 49 12 µg/m3
4:00 AM I25DEN PM10 24 Good 49 53 µg/m3
3:00 AM I25DEN PM10 24 Good 49 53 µg/m3
2:00 AM I25DEN PM10 24 Good 49 53 µg/m3
4:00 AM CASA PM2.5 24 Good 48 12 µg/m3
3:00 AM CASA PM2.5 24 Good 48 11 µg/m3
1:00 AM I25DEN PM10 24 Good 48 52 µg/m3
2:00 AM CASA PM2.5 24 Good 47 11 µg/m3
1:00 AM CASA PM2.5 24 Good 45 11 µg/m3
4:00 AM CAMP PM10 24 Good 44 47 µg/m3
3:00 AM CAMP PM10 24 Good 44 47 µg/m3
2:00 AM CAMP PM10 24 Good 44 48 µg/m3
1:00 AM CAMP PM10 24 Good 44 47 µg/m3
5:00 AM CAMP PM10 24 Good 43 46 µg/m3
5:00 AM CASA PM10 24 Good 42 45 µg/m3
4:00 AM CASA PM10 24 Good 42 45 µg/m3
3:00 AM CASA PM10 24 Good 42 45 µg/m3
2:00 AM CASA PM10 24 Good 41 44 µg/m3
1:00 AM I25GLO NO2 1 Good 41 43 PPB
5:00 AM ASPN2 PM2.5 24 Good 40 10 µg/m3
4:00 AM ASPN2 PM2.5 24 Good 40 10 µg/m3
2:00 AM I25GLO NO2 1 Good 40 42 PPB
1:00 AM CASA PM10 24 Good 40 43 µg/m3
5:00 AM NJH PM2.5 24 Good 39 9 µg/m3
5:00 AM RFN O3 8 Good 39 42 PPB
4:00 AM NJH PM2.5 24 Good 39 9 µg/m3
4:00 AM RFN O3 8 Good 39 42 PPB
3:00 AM ASPN2 PM2.5 24 Good 39 9 µg/m3
5:00 AM CHAT PM10 24 Good 38 41 µg/m3
5:00 AM CHAT PM2.5 24 Good 38 9 µg/m3
4:00 AM CHAT PM10 24 Good 38 41 µg/m3
3:00 AM CHAT PM10 24 Good 38 41 µg/m3
3:00 AM NJH PM2.5 24 Good 38 9 µg/m3
3:00 AM RFN O3 8 Good 38 41 PPB
2:00 AM ASPN2 PM2.5 24 Good 38 9 µg/m3
2:00 AM NJH PM2.5 24 Good 38 9 µg/m3
2:00 AM RFN O3 8 Good 38 41 PPB
1:00 AM ASPN2 PM2.5 24 Good 38 9 µg/m3
5:00 AM I25GLO NO2 1 Good 37 39 PPB
4:00 AM CHAT PM2.5 24 Good 37 9 µg/m3
3:00 AM AURE O3 8 Good 37 40 PPB
3:00 AM I25GLO NO2 1 Good 37 39 PPB
2:00 AM AURE O3 8 Good 37 40 PPB
2:00 AM CHAT PM10 24 Good 37 40 µg/m3
1:00 AM AURE O3 8 Good 37 40 PPB
1:00 AM CHAT PM10 24 Good 37 40 µg/m3
1:00 AM NJH PM2.5 24 Good 37 9 µg/m3
5:00 AM AURE O3 8 Good 36 39 PPB
5:00 AM MAN O3 8 Good 36 39 PPB
5:00 AM NREL O3 8 Good 36 39 PPB
4:00 AM AURE O3 8 Good 36 39 PPB
3:00 AM CHAT PM2.5 24 Good 36 9 µg/m3
3:00 AM SWAN NO2 1 Good 36 38 PPB
1:00 AM RFN O3 8 Good 36 39 PPB
4:00 AM I25GLO NO2 1 Good 35 37 PPB
4:00 AM MAN O3 8 Good 35 38 PPB
4:00 AM NREL O3 8 Good 35 38 PPB
2:00 AM CHAT PM2.5 24 Good 35 9 µg/m3
1:00 AM CHAT PM2.5 24 Good 35 8 µg/m3
1:00 AM ELK O3 8 Good 35 38 PPB
5:00 AM ASP O3 8 Good 34 37 PPB
5:00 AM HLD O3 8 Good 34 37 PPB
4:00 AM ELK O3 8 Good 34 37 PPB
3:00 AM ELK O3 8 Good 34 37 PPB
3:00 AM NREL O3 8 Good 34 37 PPB
2:00 AM ELK O3 8 Good 34 37 PPB
1:00 AM SWAN NO2 1 Good 34 36 PPB
5:00 AM ASPN2 PM10 24 Good 33 36 µg/m3
5:00 AM ELK O3 8 Good 33 36 PPB
4:00 AM ASP O3 8 Good 33 36 PPB
4:00 AM ASPN2 PM10 24 Good 33 36 µg/m3
4:00 AM HLD O3 8 Good 33 36 PPB
3:00 AM ASPN2 PM10 24 Good 33 36 µg/m3
3:00 AM MAN O3 8 Good 33 36 PPB
2:00 AM NREL O3 8 Good 33 36 PPB
1:00 AM CASA NO2 1 Good 33 35 PPB
1:00 AM NREL O3 8 Good 33 36 PPB
5:00 AM GJPB PM2.5 24 Good 32 8 µg/m3
4:00 AM GJPB PM2.5 24 Good 32 8 µg/m3
3:00 AM ASP O3 8 Good 32 35 PPB
2:00 AM ASPN2 PM10 24 Good 32 35 µg/m3
2:00 AM MAN O3 8 Good 32 35 PPB
1:00 AM ASPN2 PM10 24 Good 32 35 µg/m3
1:00 AM MAN O3 8 Good 32 35 PPB
5:00 AM ASPN O3 8 Good 31 34 PPB
5:00 AM DELT PM2.5 24 Good 31 8 µg/m3
5:00 AM WCH O3 8 Good 31 34 PPB
4:00 AM ASPN O3 8 Good 31 34 PPB
4:00 AM FTCW O3 8 Good 31 33 PPB
4:00 AM WCH O3 8 Good 31 34 PPB
3:00 AM ASPN O3 8 Good 31 34 PPB
3:00 AM CASA NO2 1 Good 31 33 PPB
3:00 AM FTCW O3 8 Good 31 34 PPB
3:00 AM GJPB PM2.5 24 Good 31 8 µg/m3
3:00 AM HLD O3 8 Good 31 34 PPB
3:00 AM WCH O3 8 Good 31 33 PPB
2:00 AM ASP O3 8 Good 31 33 PPB
2:00 AM ASPN O3 8 Good 31 34 PPB
2:00 AM CASA NO2 1 Good 31 33 PPB
2:00 AM FTCW O3 8 Good 31 34 PPB
2:00 AM SWAN NO2 1 Good 31 33 PPB
1:00 AM ASPN O3 8 Good 31 34 PPB
1:00 AM FTCW O3 8 Good 31 33 PPB
1:00 AM PDX O3 8 Good 31 33 PPB
5:00 AM CASA NO2 1 Good 30 32 PPB
5:00 AM FTCW O3 8 Good 30 32 PPB
4:00 AM DELT PM2.5 24 Good 30 7 µg/m3
3:00 AM DELT PM2.5 24 Good 30 7 µg/m3
2:00 AM GJPB PM2.5 24 Good 30 7 µg/m3
2:00 AM HLD O3 8 Good 30 32 PPB
2:00 AM WBY PM10 24 Good 30 32 µg/m3
1:00 AM GJPB PM2.5 24 Good 30 7 µg/m3
1:00 AM I25DEN NO2 1 Good 30 32 PPB
1:00 AM WBY PM10 24 Good 30 32 µg/m3
5:00 AM I25DEN NO2 1 Good 29 31 PPB
5:00 AM WBY PM10 24 Good 29 31 µg/m3
4:00 AM CASA NO2 1 Good 29 31 PPB
4:00 AM SWAN NO2 1 Good 29 31 PPB
4:00 AM WBY PM10 24 Good 29 31 µg/m3
3:00 AM WBY PM10 24 Good 29 31 µg/m3
2:00 AM DELT PM2.5 24 Good 29 7 µg/m3
2:00 AM PDX O3 8 Good 29 31 PPB
1:00 AM ASP O3 8 Good 29 31 PPB
1:00 AM DELT PM2.5 24 Good 29 7 µg/m3
1:00 AM PAL O3 8 Good 29 31 PPB
1:00 AM WBY NO2 1 Good 29 31 PPB
1:00 AM WBY NO2 1 Good 29 31 PPB
5:00 AM WBY NO2 1 Good 28 30 PPB
5:00 AM WBY NO2 1 Good 28 30 PPB
2:00 AM I25DEN NO2 1 Good 28 30 PPB
2:00 AM PAL O3 8 Good 28 30 PPB
2:00 AM WCH O3 8 Good 28 30 PPB
1:00 AM HLD O3 8 Good 28 30 PPB
5:00 AM GJPB PM10 24 Good 27 29 µg/m3
4:00 AM GJPB PM10 24 Good 27 29 µg/m3
4:00 AM PAL O3 8 Good 27 29 PPB
3:00 AM PAL O3 8 Good 27 29 PPB
3:00 AM PDX O3 8 Good 27 29 PPB
2:00 AM CAMP NO2 1 Good 27 29 PPB
2:00 AM CAMP NO2 1 Good 27 29 PPB
5:00 AM PAL O3 8 Good 26 28 PPB
3:00 AM GJPB PM10 24 Good 26 28 µg/m3
3:00 AM I25DEN NO2 1 Good 26 28 PPB
2:00 AM GJPB PM10 24 Good 26 28 µg/m3
2:00 AM WBY NO2 1 Good 26 28 PPB
2:00 AM WBY NO2 1 Good 26 28 PPB
4:00 AM I25DEN NO2 1 Good 25 27 PPB
4:00 AM PDX O3 8 Good 25 27 PPB
4:00 AM WBY NO2 1 Good 25 27 PPB
4:00 AM WBY NO2 1 Good 25 27 PPB
3:00 AM WBY NO2 1 Good 25 27 PPB
3:00 AM WBY NO2 1 Good 25 27 PPB
1:00 AM GJPB PM10 24 Good 25 27 µg/m3
5:00 AM CCOL PM2.5 24 Good 24 6 µg/m3
5:00 AM PDX O3 8 Good 24 26 PPB
4:00 AM CCOL PM2.5 24 Good 24 6 µg/m3
1:00 AM CAMP NO2 1 Good 24 25 PPB
1:00 AM CAMP NO2 1 Good 24 25 PPB
1:00 AM WCH O3 8 Good 24 26 PPB
3:00 AM CCOL PM2.5 24 Good 23 6 µg/m3
2:00 AM CCOL PM2.5 24 Good 23 6 µg/m3
5:00 AM SWAN NO2 1 Good 22 23 PPB
5:00 AM SWAN PM2.5 24 Good 22 5 µg/m3
4:00 AM SWAN PM2.5 24 Good 22 5 µg/m3
3:00 AM SWAN PM2.5 24 Good 22 5 µg/m3
2:00 AM SWAN PM2.5 24 Good 22 5 µg/m3
1:00 AM CCOL PM2.5 24 Good 22 5 µg/m3
1:00 AM SWAN PM2.5 24 Good 22 5 µg/m3
5:00 AM BOU PM2.5 24 Good 21 5 µg/m3
4:00 AM BOU PM2.5 24 Good 21 5 µg/m3
3:00 AM BOU PM2.5 24 Good 21 5 µg/m3
2:00 AM BOU PM2.5 24 Good 21 5 µg/m3
1:00 AM BOU PM2.5 24 Good 21 5 µg/m3
5:00 AM ACAD O3 8 Good 20 22 PPB
5:00 AM CHAT O3 8 Good 19 21 PPB
5:00 AM CTZ O3 8 Good 19 20 PPB
4:00 AM CHAT O3 8 Good 19 20 PPB
3:00 AM CHAT O3 8 Good 19 20 PPB
2:00 AM CHAT O3 8 Good 19 21 PPB
1:00 AM CHAT O3 8 Good 19 21 PPB
5:00 AM BOUR O3 8 Good 18 19 PPB
4:00 AM ACAD O3 8 Good 18 19 PPB
4:00 AM CTZ O3 8 Good 18 19 PPB
3:00 AM CTZ O3 8 Good 18 19 PPB
4:00 AM BOUR O3 8 Good 17 18 PPB
1:00 AM BOUR O3 8 Good 17 18 PPB
1:00 AM CTZ O3 8 Good 17 18 PPB
5:00 AM RIFL PM2.5 24 Good 16 4 µg/m3
3:00 AM BOUR O3 8 Good 16 17 PPB
2:00 AM BOUR O3 8 Good 16 17 PPB
2:00 AM CTZ O3 8 Good 16 17 PPB
4:00 AM RIFL PM2.5 24 Good 15 4 µg/m3
3:00 AM CAMP NO2 1 Good 15 16 PPB
3:00 AM CAMP NO2 1 Good 15 16 PPB
1:00 AM ACAD O3 8 Good 15 16 PPB
1:00 AM RIFL PM2.5 24 Good 15 4 µg/m3
1:00 AM RIFLO3 O3 8 Good 15 16 PPB
4:00 AM CAMP NO2 1 Good 14 15 PPB
4:00 AM CAMP NO2 1 Good 14 15 PPB
4:00 AM RIFLO3 O3 8 Good 14 15 PPB
3:00 AM ACAD O3 8 Good 14 15 PPB
3:00 AM RIFL PM2.5 24 Good 14 3 µg/m3
2:00 AM ACAD O3 8 Good 14 15 PPB
2:00 AM I25DEN CO 8 Good 14 1.2 PPM
2:00 AM RIFL PM2.5 24 Good 14 3 µg/m3
1:00 AM I25DEN CO 8 Good 14 1.2 PPM
5:00 AM RIFLO3 O3 8 Good 13 14 PPB
5:00 AM CCOL PM10 24 Good 12 13 µg/m3
3:00 AM I25DEN CO 8 Good 12 1.1 PPM
3:00 AM RIFLO3 O3 8 Good 12 13 PPB
2:00 AM RIFLO3 O3 8 Good 12 13 PPB
5:00 AM CAMP NO2 1 Good 11 12 PPB
5:00 AM CAMP NO2 1 Good 11 12 PPB
5:00 AM CAMP O3 8 Good 11 12 PPB
4:00 AM CCOL PM10 24 Good 11 12 µg/m3
3:00 AM CCOL PM10 24 Good 11 12 µg/m3
2:00 AM CCOL PM10 24 Good 11 12 µg/m3
1:00 AM CCOL PM10 24 Good 11 12 µg/m3
5:00 AM I25DEN CO 8 Good 10 0.9 PPM
4:00 AM I25DEN CO 8 Good 10 0.9 PPM
1:00 AM CAMP CO 8 Good 9 0.8 PPM
4:00 AM CAMP O3 8 Good 8 9 PPB
4:00 AM CASA CO 8 Good 8 0.7 PPM
3:00 AM CASA CO 8 Good 8 0.7 PPM
3:00 AM WBY CO 8 Good 8 0.7 PPM
2:00 AM CAMP CO 8 Good 8 0.7 PPM
2:00 AM CASA CO 8 Good 8 0.7 PPM
2:00 AM SWAN CO 8 Good 8 0.7 PPM
2:00 AM WBY CO 8 Good 8 0.7 PPM
1:00 AM CASA CO 8 Good 8 0.7 PPM
1:00 AM FTC CO 8 Good 8 0.7 PPM
5:00 AM CASA CO 8 Good 7 0.6 PPM
4:00 AM SWAN CO 8 Good 7 0.6 PPM
4:00 AM WBY CO 8 Good 7 0.6 PPM
3:00 AM CAMP CO 8 Good 7 0.6 PPM
3:00 AM FTC CO 8 Good 7 0.6 PPM
3:00 AM SWAN CO 8 Good 7 0.6 PPM
2:00 AM FTC CO 8 Good 7 0.6 PPM
1:00 AM SWAN CO 8 Good 7 0.6 PPM
1:00 AM WBY CO 8 Good 7 0.6 PPM
5:00 AM GRET O3 8 Good 6 6 PPB
5:00 AM SWAN CO 8 Good 6 0.5 PPM
5:00 AM SWAN PM10 24 Good 6 7 µg/m3
5:00 AM WBY CO 8 Good 6 0.5 PPM
4:00 AM FTC CO 8 Good 6 0.5 PPM
4:00 AM GRET O3 8 Good 6 6 PPB
4:00 AM SWAN PM10 24 Good 6 7 µg/m3
3:00 AM CAMP O3 8 Good 6 7 PPB
3:00 AM GRET O3 8 Good 6 7 PPB
3:00 AM SWAN PM10 24 Good 6 7 µg/m3
2:00 AM GRET O3 8 Good 6 7 PPB
2:00 AM SWAN PM10 24 Good 6 6 µg/m3
1:00 AM GRET O3 8 Good 6 6 PPB
1:00 AM H24 CO 8 Good 6 0.5 PPM
1:00 AM SWAN PM10 24 Good 6 6 µg/m3
5:00 AM FTC CO 8 Good 5 0.4 PPM
4:00 AM CAMP CO 8 Good 5 0.4 PPM
4:00 AM H24 CO 8 Good 5 0.4 PPM
3:00 AM H24 CO 8 Good 5 0.4 PPM
2:00 AM CAMP O3 8 Good 5 5 PPB
2:00 AM H24 CO 8 Good 5 0.4 PPM
1:00 AM CAMP O3 8 Good 4 4 PPB
5:00 AM CAMP CO 8 Good 3 0.3 PPM
5:00 AM H24 CO 8 Good 3 0.3 PPM
5:00 AM WBY SO2 1 Good 3 2 PPB
5:00 AM WBY SO2 1 Good 3 2 PPB
3:00 AM CASA SO2 1 Good 3 2 PPB
2:00 AM GRET CO 8 Good 3 0.3 PPM
2:00 AM WBY SO2 1 Good 3 2 PPB
2:00 AM WBY SO2 1 Good 3 2 PPB
1:00 AM GJCT CO 8 Good 3 0.3 PPM
1:00 AM GRET CO 8 Good 3 0.3 PPM
1:00 AM WBY SO2 1 Good 3 2 PPB
1:00 AM WBY SO2 1 Good 3 2 PPB
5:00 AM GJCT CO 8 Good 2 0.2 PPM
5:00 AM GRET CO 8 Good 2 0.2 PPM
4:00 AM GJCT CO 8 Good 2 0.2 PPM
4:00 AM GRET CO 8 Good 2 0.2 PPM
3:00 AM GJCT CO 8 Good 2 0.2 PPM
3:00 AM GRET CO 8 Good 2 0.2 PPM
2:00 AM GJCT CO 8 Good 2 0.2 PPM
5:00 AM CASA SO2 1 Good 1 1 PPB
5:00 AM FTC O3 8 Good 1 1 PPB
4:00 AM CASA SO2 1 Good 1 1 PPB
4:00 AM FTC O3 8 Good 1 1 PPB
4:00 AM WBY SO2 1 Good 1 1 PPB
4:00 AM WBY SO2 1 Good 1 1 PPB
3:00 AM FTC O3 8 Good 1 1 PPB
3:00 AM WBY SO2 1 Good 1 1 PPB
3:00 AM WBY SO2 1 Good 1 1 PPB
2:00 AM CAMP SO2 1 Good 1 1 PPB
2:00 AM CAMP SO2 1 Good 1 1 PPB
2:00 AM CASA SO2 1 Good 1 1 PPB
2:00 AM FTC O3 8 Good 1 1 PPB
1:00 AM CASA O3 8 Good 1 1 PPB
1:00 AM FTC O3 8 Good 1 1 PPB
1:00 AM WBY O3 8 Good 1 1 PPB
5:00 AM CASA O3 8 Good 0 0 PPB
4:00 AM CASA O3 8 Good 0 0 PPB
3:00 AM CASA O3 8 Good 0 0 PPB
2:00 AM CASA O3 8 Good 0 0 PPB
2:00 AM WBY O3 8 Good 0 0 PPB

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