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.

01/21
01/22
01/23
01/24
01/25
01/26
01/27

San Joaquin

Stockton-University 48 (PM25) 65 (PM25) 98 (PM25) 82 (PM25) 79 (PM25) 76 (PM25) 75 (PM25)

Manteca 52 (PM25) 64 (PM25) 96 (PM25) 84 (PM25) 69 (PM25) 84 (PM25) 67 (PM25)

Tracy-Airport 31 (O3-8) 31 (O3-8) 45 (PM25) 39 (PM25) 29 (O3-8) 54 (PM25) 29 (O3-8)

Stanislaus

Modesto-14th 62 (PM25) 81 (PM25) 102 (PM25) 91 (PM25) 84 (PM25) 90 (PM25) 84 (PM25)

Turlock 57 (PM25) 99 (PM25) 79 (PM25) 75 (PM25) 76 (PM25) 83 (PM25) 82 (PM25)

Merced

Merced-M St. 86 (PM25) 115 (PM25) 85 (PM25) 69 (PM25) 73 (PM25) 82 (PM25) 77 (PM25)

Merced-Coffee 78 (PM25) 95 (PM25) 78 (PM25) 61 (PM25) 64 (PM25) 82 (PM25) 73 (PM25)

Madera

Madera-City 81 (PM25) 94 (PM25) 75 (PM25) 64 (PM25) 70 (PM25) 68 (PM25) 61 (PM25)

Madera 17 (O3-8) 27 (O3-8) 32 (O3-8) 31 (O3-8) 35 (O3-8) 36 (O3-8) 38 (O3-8)

Fresno

Fresno-SSP 14 (O3-8) 23 (O3-8) 31 (O3-8) 31 (O3-8) 28 (O3-8) 34 (O3-8) 35 (O3-8)

Clovis 97 (PM25) 93 (PM25) 73 (PM25) 68 (PM25) 86 (PM25) 70 (PM25) 67 (PM25)

Fresno-Garland 105 (PM25) 106 (PM25) 94 (PM25) 76 (PM25) 82 (PM25) 77 (PM25) 74 (PM25)

Fresno-Foundry 127 (PM25) 112 (PM25) 103 (PM25) 77 (PM25) 105 (PM25) 90 (PM25) 96 (PM25)

Fresno-Pacific 123 (PM25) 111 (PM25) 95 (PM25) 71 (PM25) 84 (PM25) 80 (PM25) 80 (PM25)

Fresno-Drummond 8 (O3-8) 26 (O3-8) 29 (O3-8) 28 (O3-8) 24 (O3-8) 56 (PM10) 60 (PM10)

Parlier 14 (O3-8) 31 (O3-8) 33 (O3-8) 32 (O3-8) 33 (O3-8) 35 (O3-8) 37 (O3-8)

Tranquillity 57 (PM25) 49 (PM25) 37 (PM25) 38 (PM25) 54 (PM25) 61 (PM25) 61 (PM25)

Huron 60 (PM25) 26 (PM25) 38 (PM25) 43 (PM25) 57 (PM25) 62 (PM25) 65 (PM25)

Kings

Hanford 94 (PM25) 87 (PM25) 89 (PM25) 86 (PM25) 86 (PM25) 88 (PM25) 102 (PM25)

Corcoran 97 (PM25) 87 (PM25) 77 (PM25) 83 (PM25) 91 (PM25) 88 (PM25) 103 (PM25)

Tulare

Visalia, Church

Porterville 103 (PM25) 71 (PM25) 53 (PM25) 55 (PM25) 72 (PM25) 61 (PM25) 54 (PM25)

Ash Mountain-SNP 64 (PM25) 39 (PM25) 37 (O3-8) 34 (O3-8) 36 (O3-8) 38 (O3-8) 38 (O3-8)

Lower Kaweah-SNP 42 (O3-8) 43 (O3-8) 43 (O3-8) 40 (O3-8) 38 (O3-8) 39 (O3-8) 41 (O3-8)

Kern

Shafter 21 (O3-8) 26 (O3-8) 29 (O3-8) 31 (O3-8) 31 (O3-8) 31 (O3-8) 31 (O3-8)

Oildale 63 (PM10) 42 (PM10) 32 (O3-8) 33 (PM10) 40 (PM10) 35 (PM10) 45 (PM10)

Bakersfield-Gold 81 (PM25) 73 (PM25)

Bakersfield-Calif 143 (PM25) 87 (PM25) 77 (PM25) 66 (PM25) 76 (PM25) 67 (PM25) 75 (PM25)

Bakersfield-Muni 19 (O3-8) 25 (O3-8) 26 (O3-8) 26 (O3-8) 29 (O3-8) 29 (O3-8)

Edison 20 (O3-8) 31 (O3-8) 29 (O3-8) 27 (O3-8) 33 (O3-8) 34 (O3-8) 34 (O3-8)

Arvin-DiGiorgio 26 (O3-8) 27 (O3-8) 34 (O3-8) 36 (O3-8) 35 (O3-8) 34 (O3-8) 36 (O3-8)

Maricopa 31 (O3-8) 32 (O3-8) 36 (O3-8) 40 (O3-8) 44 (O3-8) 40 (O3-8) 41 (O3-8)

Lebec 77 (PM25) 19 (PM25) 4 (PM25) 15 (PM25) 4 (PM25) 4 (PM25)

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 0
Federal 1997 24-hr PM2.5 0

O3-1hr (ppb) 51
Federal 2008 8-Hr Ozone 0
Federal 24-hr PM10 0

O3-8hr (ppb) 48
Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 0

PM 10 (µg/m³) 79
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 53.9
Federal 2006 24-hr PM2.5 15
State 24-hr PM10 11
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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Friday, January 28, 2022 Page 1 of 1