| | AQI by Site |
| | AQI is determined using real-time data measured at each site. AQI is based on the pollutant that measured highest. |
| | Factors such as site capabilities, seasonality, wildfire or wind events, and/or technical difficulties influence which |
| | pollutant is used to determine AQI. The data in this report is preliminary and subject to change. |
| | 09/16 | | 09/17 | | 09/18 | | 09/19 | | 09/20 | | 09/21 | | 09/22 |
| | San Joaquin |
| | Stockton-Hazelton | 59 (PM25) | 64 (PM25) | 50 (PM25) | 38 (PM25) | 40 (O3-8) | 74 (O3-8) | 44 (O3-8) |
| | Manteca | 55 (PM25) | 55 (PM25) | 29 (PM25) | 21 (PM25) | 51 (PM10) | 73 (PM10) | 55 (PM25) |
| | Tracy-Airport | 45 (O3-8) | 50 (PM25) | 29 (PM25) | 38 (O3-8) | 52 (PM10) | 77 (O3-8) | 61 (O3-8) |
| | Stanislaus |
| | Modesto-14th | 57 (PM25) | 62 (PM25) | 46 (PM25) | 41 (O3-8) | 51 (PM10) | 93 (O3-8) | 87 (O3-8) |
| | Turlock | 61 (O3-8) | 62 (PM25) | 46 (PM25) | 41 (O3-8) | 44 (O3-8) | 84 (O3-8) | 97 (O3-8) |
| | Merced |
| | Merced-M St. | 50 (PM25) | 53 (PM25) | 38 (PM25) | 13 (PM25) | 33 (PM25) | 57 (PM25) | 59 (PM25) |
| | Merced-Coffee | 64 (O3-8) | 80 (O3-8) | 44 (O3-8) | 40 (O3-8) | 42 (O3-8) | 59 (PM25) | 97 (O3-8) |
| | Madera |
| | Madera-City | 74 (O3-8) | 70 (PM10) | 56 (PM10) | 40 (O3-8) | 60 (PM10) | 78 (PM10) | 156 (O3-8) |
| | Madera | 67 (O3-8) | 67 (O3-8) | 45 (O3-8) | 38 (O3-8) | 43 (O3-8) | 41 (O3-8) | 143 (O3-8) |
| | Fresno |
| | Fresno-SSP | 84 (O3-8) | 93 (O3-8) | 45 (O3-8) | 36 (O3-8) | 44 (O3-8) | 45 (O3-8) | 147 (O3-8) |
| | Clovis | 101 (O3-8) | 97 (O3-8) | 55 (PM10) | 37 (O3-8) | 53 (PM10) | 72 (PM25) | 132 (PM25) |
| | Fresno-Garland | 90 (O3-8) | 87 (O3-8) | 55 (PM10) | 36 (O3-8) | 48 (PM10) | 72 (PM25) | 151 (O3-8) |
| | Fresno-Foundry | 70 (PM25) | 66 (PM25) | 62 (PM25) | 25 (PM25) | 42 (PM25) | 83 (PM25) | 122 (PM25) |
| | Fresno-Pacific | 55 (PM25) | 55 (PM25) | 46 (PM25) | 13 (PM25) | 25 (PM25) | 74 (PM25) | 107 (PM25) |
| | Fresno-Drummond | 133 (O3-8) | 97 (O3-8) | 54 (O3-8) | 37 (O3-8) | 50 (O3-8) | 105 (O3-8) |
| | Parlier | 122 (O3-8) | 61 (O3-8) | 58 (O3-8) | 35 (O3-8) | 42 (O3-8) | 42 (O3-8) | 90 (O3-8) |
| | Tranquillity | 50 (PM25) | 49 (O3-8) | 42 (PM25) | 34 (O3-8) | 37 (O3-8) | 59 (PM25) | 100 (O3-8) |
| | Huron | 50 (PM25) | 42 (PM25) | 38 (PM25) | 8 (PM25) | 25 (PM25) | 74 (PM25) | 62 (PM25) |
| | Kings |
| | Hanford | 80 (PM10) | 71 (O3-8) | 73 (PM10) | 53 (PM10) | 61 (PM10) | 104 (PM10) | 105 (PM10) |
| | Corcoran | 79 (PM10) | 70 (PM10) | 75 (PM10) | 59 (PM10) | 62 (PM10) | 105 (PM10) | 113 (PM10) |
| | Tulare |
| | Visalia, Church | 115 (O3-8) | 93 (PM25) | 93 (O3-8) | 40 (PM10) | 57 (PM10) | 159 (PM25) | 160 (PM25) |
| | Porterville | 108 (O3-8) | 93 (O3-8) | 105 (O3-8) | 38 (PM25) | 169 (PM25) | 133 (O3-8) |
| | Ash Mountain-SNP |
| | Lower Kaweah-SNP |
| | Kern |
| | Shafter | 64 (O3-8) | 67 (O3-8) | 50 (O3-8) | 29 (O3-8) | 43 (O3-8) | 71 (O3-8) | 93 (O3-8) |
| | Oildale | 93 (O3-8) | 48 (O3-8) | 88 (PM10) | 129 (O3-8) |
| | Bakersfield-Gold | 62 (PM25) | 59 (PM25) | 57 (PM25) | 29 (PM25) | 55 (PM25) | 115 (PM25) | 119 (PM25) |
| | Bakersfield-Calif | 58 (O3-8) | 64 (O3-8) | 47 (O3-8) | 29 (O3-8) | 46 (PM25) | 95 (PM25) | 102 (PM25) |
| | Bakersfield-Muni | 64 (O3-8) | 80 (O3-8) | 51 (O3-8) | 30 (O3-8) | 47 (O3-8) | 58 (O3-8) | 108 (O3-8) |
| | Edison | 100 (O3-8) | 115 (O3-8) | 80 (O3-8) | 36 (O3-8) | 64 (O3-8) | 87 (O3-8) | 164 (O3-8) |
| | Arvin-DiGiorgio | 93 (O3-8) | 97 (O3-8) | 74 (O3-8) | 35 (O3-8) | 51 (O3-8) | 64 (O3-8) | 126 (O3-8) |
| | Maricopa | 100 (O3-8) | 87 (O3-8) | 74 (O3-8) | 34 (O3-8) | 46 (O3-8) | 101 (O3-8) | 97 (O3-8) |
| | Lebec | 42 (PM25) | 29 (PM25) | 29 (PM25) | 17 (PM25) | 55 (PM25) | 50 (PM25) |
| | Maximum Measured | Unofficial Days Over the Federal and State Standards¹ |
| | Value for This Year |
| | Pollutant | Maximum | Federal 2015 8-Hr Ozone | 97 | | Federal 1997 24-hr PM2.5 | 0 |
| | O3-1hr (ppb) | 116 | | Federal 2008 8-Hr Ozone | 71 | | Federal 24-hr PM10 | 0 |
| | O3-8hr (ppb) | 97 | | Federal 1997 8-Hr Ozone | 13 | | State 1-Hr Ozone | 36 |
| | PM 10 (µg/m³) | 149 | | Federal 1-Hr Ozone | 0 | | State 1997 8-Hr Ozone | 97 |
| | PM 2.5 (µg/m³) | 63.5 | | Federal 2006 24-hr PM2.5 | 15 | | State 24-hr PM10 | 154 |
| ¹Data affected by smoke, high winds, fireworks, and etc. and which exceeded a federal standard are denoted |
| with an ‘x’ in the table above. Values marked with an ‘x’ are not included in the tallies above. |
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| Thursday, September 23, 2021 | Page 1 of 1 |