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.

09/14
09/15
09/16
09/17
09/18
09/19
09/20

San Joaquin

Stockton-University 40 (O3-8) 42 (PM25) 38 (O3-8) 40 (O3-8) 54 (PM25) 104 (PM25)

Manteca 46 (PM25) 39 (PM25) 38 (PM25) 27 (PM25) 24 (PM10) 54 (PM25) 107 (PM25)

Tracy-Airport

Stanislaus

Modesto-14th 74 (O3-8) 47 (O3-8) 44 (PM25) 43 (O3-8) 45 (O3-8) 50 (PM25) 92 (PM25)

Turlock 84 (O3-8) 54 (O3-8) 46 (PM25) 45 (O3-8) 46 (O3-8) 50 (O3-8) 87 (PM25)

Merced

Merced-M St. 54 (PM10) 59 (PM10) 51 (PM10) 29 (PM25) 42 (PM10) 46 (PM10) 68 (PM25)

Merced-Coffee 100 (O3-8) 54 (O3-8) 48 (O3-8) 45 (O3-8) 46 (O3-8) 48 (O3-8) 66 (PM25)

Madera

Madera-City 84 (O3-8) 71 (O3-8) 55 (PM10) 49 (PM25) 50 (PM10) 50 (PM10) 67 (PM25)

Madera 74 (O3-8) 64 (O3-8) 48 (O3-8) 43 (O3-8) 42 (O3-8) 45 (O3-8) 50 (O3-8)

Fresno

Fresno-SSP 100 (O3-8) 90 (O3-8) 50 (O3-8) 44 (O3-8) 44 (O3-8) 48 (O3-8) 51 (O3-8)

Clovis 100 (O3-8) 105 (O3-8) 52 (PM10) 44 (O3-8) 44 (O3-8) 46 (O3-8) 54 (PM25)

Fresno-Garland 84 (O3-8) 90 (O3-8) 53 (PM10) 48 (PM25) 44 (PM10) 44 (O3-8) 61 (PM25)

Fresno-Foundry 54 (PM25) 54 (PM25) 48 (PM25) 42 (PM25) 38 (PM25) 40 (PM25) 59 (PM25)

Fresno-Pacific 52 (PM25) 54 (PM25) 50 (PM25) 39 (PM25) 33 (PM25) 35 (PM25) 59 (PM25)

Fresno-Drummond 108 (O3-8) 140 (O3-8) 58 (O3-8) 45 (O3-8) 51 (PM10) 50 (PM10) 54 (O3-8)

Parlier 108 (O3-8) 122 (O3-8) 74 (O3-8) 46 (O3-8) 45 (O3-8) 49 (O3-8) 61 (O3-8)

Tranquillity 50 (O3-8) 49 (O3-8) 42 (O3-8) 38 (O3-8) 39 (O3-8) 44 (O3-8) 55 (PM25)

Huron 26 (PM25) 40 (PM25) 39 (PM25) 31 (PM25) 28 (PM25) 28 (PM25) 45 (PM25)

Kings

Hanford 80 (O3-8) 90 (O3-8) 63 (PM10) 44 (O3-8) 60 (PM10) 57 (PM10) 64 (PM25)

Corcoran 61 (PM10) 67 (PM10) 61 (PM10) 38 (PM10) 55 (PM10) 58 (PM10) 56 (PM25)

Tulare

Visalia-Ashland 93 (O3-8) 105 (O3-8) 74 (O3-8) 46 (O3-8) 49 (PM10) 51 (O3-8) 64 (O3-8)

Porterville 100 (O3-8) 119 (O3-8) 115 (O3-8) 64 (O3-8) 48 (O3-8) 64 (O3-8) 80 (O3-8)

Ash Mountain-SNP 157 (PM25) 125 (PM25) 119 (O3-8) 81 (PM25) 62 (PM25) 122 (PM25) 152 (PM25)

Lower Kaweah-SNP 67 (O3-8) 64 (O3-8) 84 (O3-8) 54 (O3-8) 44 (O3-8) 51 (O3-8) 61 (O3-8)

Kern

Shafter 87 (O3-8) 90 (O3-8) 54 (O3-8) 44 (O3-8) 43 (O3-8) 46 (O3-8) 61 (O3-8)

Oildale 100 (O3-8) 122 (O3-8) 84 (O3-8) 47 (O3-8) 49 (PM10) 57 (PM10) 61 (O3-8)

Bakersfield-Gold 65 (PM10) 79 (PM10) 61 (PM10) 43 (PM25) 51 (PM10) 60 (PM10) 58 (PM25)

Bakersfield-Calif 97 (O3-8) 105 (O3-8) 67 (O3-8) 45 (O3-8) 44 (O3-8) 54 (PM10) 54 (O3-8)

Bakersfield-Muni 115 (O3-8) 129 (O3-8) 84 (O3-8) 47 (O3-8) 45 (O3-8) 61 (O3-8) 64 (O3-8)

Edison 115 (O3-8) 154 (O3-8) 122 (O3-8) 58 (O3-8) 49 (O3-8) 67 (O3-8) 80 (O3-8)

Arvin-DiGiorgio 122 (O3-8) 156 (O3-8) 119 (O3-8) 64 (O3-8) 50 (O3-8) 54 (O3-8) 87 (O3-8)

Maricopa 71 (O3-8) 105 (O3-8) 80 (O3-8) 47 (O3-8) 44 (O3-8) 49 (O3-8) 67 (O3-8)

Lebec 23 (PM25) 32 (PM25) 25 (PM25) 35 (PM25) 35 (PM25) 41 (PM25) 46 (PM25)

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 57
Federal 1997 24-hr PM2.5 0

O3-1hr (ppb) 109
Federal 2008 8-Hr Ozone 35
Federal 24-hr PM10 0

O3-8hr (ppb) 93
Federal 1997 8-Hr Ozone 9
State 1-Hr Ozone 15

PM 10 (µg/m³) 144
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 57

PM 2.5 (µg/m³) 40.6
Federal 2006 24-hr PM2.5 3
State 24-hr PM10 108
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 21, 2023 Page 1 of 1