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