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.

01/09
01/10
01/11
01/12
01/13
01/14
01/15

San Joaquin

Stockton-Hazelton 62 (PM25) 89 (PM25) 99 (PM25) 122 (PM25) 107 (PM25) 83 (PM25) 91 (PM25)

Manteca 59 (PM25) 80 (PM25) 85 (PM25) 115 (PM25) 95 (PM25) 53 (PM25) 72 (PM25)

Tracy-Airport 30 (O3-8) 55 (PM25) 55 (PM25) 70 (PM25) 46 (PM25) 25 (O3-8) 24 (O3-8)

Stanislaus

Modesto-14th 62 (PM25) 87 (PM25) 89 (PM25) 115 (PM25) 102 (PM25) 68 (PM25) 85 (PM25)

Turlock 59 (PM25) 80 (PM25) 83 (PM25) 115 (PM25) 107 (PM25) 70 (PM25) 80 (PM25)

Merced

Merced-Coffee 62 (PM25) 78 (PM25) 78 (PM25) 105 (PM25) 107 (PM25) 95 (PM25) 76 (PM25)

Madera

Madera-City 83 (PM25) 76 (PM25) 78 (PM25) 95 (PM25) 107 (PM25) 11 (O3-8) 24 (O3-8)

Madera 9 (O3-8) 20 (O3-8) 24 (O3-8) 17 (O3-8) 25 (O3-8) 12 (O3-8) 24 (O3-8)

Fresno

Fresno-SSP 10 (O3-8) 20 (O3-8) 21 (O3-8) 9 (O3-8) 26 (O3-8) 13 (O3-8) 25 (O3-8)

Clovis 93 (PM25) 78 (PM25) 95 (PM25) 107 (PM25) 105 (PM25) 85 (PM25) 93 (PM25)

Fresno-Garland 99 (PM25) 89 (PM25) 102 (PM25) 119 (PM25) 127 (PM25) 89 (PM25) 95 (PM25)

Fresno-Foundry 97 (PM25) 95 (PM25) 112 (PM25) 139 (PM25) 139 (PM25) 99 (PM25) 99 (PM25)

Fresno-Drummond 8 (O3-8) 15 (O3-8) 16 (O3-8) 8 (O3-8) 19 (O3-8) 14 (O3-8) 20 (O3-8)

Parlier 13 (O3-8) 21 (O3-8) 21 (O3-8) 16 (O3-8) 25 (O3-8) 25 (O3-8) 27 (O3-8)

Tranquillity 46 (PM25) 66 (PM25) 53 (PM25) 76 (PM25) 59 (PM25) 70 (PM25) 68 (PM25)

Huron 55 (PM25) 46 (PM25) 64 (PM25) 68 (PM25) 66 (PM25) 57 (PM25) 57 (PM25)

Kings

Hanford 85 (PM25) 87 (PM25) 93 (PM25) 127 (PM25) 134 (PM25) 107 (PM25) 78 (PM25)

Corcoran 78 (PM25) 74 (PM25) 87 (PM25) 105 (PM25) 119 (PM25) 107 (PM25) 85 (PM25)

Tulare

Visalia, Church 102 (PM25) 83 (PM25) 97 (PM25) 119 (PM25) 117 (PM25) 95 (PM25) 107 (PM25)

Porterville 97 (PM25) 74 (PM25) 83 (PM25) 93 (PM25) 93 (PM25) 99 (PM25) 112 (PM25)

Ash Mountain-SNP 53 (PM25) 29 (PM25) 31 (O3-8) 30 (O3-8) 33 (O3-8) 36 (O3-8) 36 (O3-8)

Lower Kaweah-SNP 35 (O3-8) 38 (O3-8) 38 (O3-8) 37 (O3-8) 31 (O3-8) 32 (O3-8) 33 (O3-8)

Kern

Shafter 16 (O3-8) 21 (O3-8) 22 (O3-8) 12 (O3-8) 25 (O3-8) 31 (O3-8) 38 (O3-8)

Oildale 34 (PM10) 26 (PM10) 35 (PM10) 56 (PM10) 61 (PM10) 61 (PM10) 72 (PM10)

Bakersfield-Calif 95 (PM25) 91 (PM25) 85 (PM25) 117 (PM25) 122 (PM25) 137 (PM25) 134 (PM25)

Bakersfield-Muni 17 (O3-8) 21 (O3-8) 19 (O3-8) 13 (O3-8) 23 (O3-8) 29 (O3-8) 33 (O3-8)

Edison 19 (O3-8) 27 (O3-8) 27 (O3-8) 19 (O3-8) 27 (O3-8) 35 (O3-8) 40 (O3-8)

Arvin-DiGiorgio 23 (O3-8) 29 (O3-8) 28 (O3-8) 27 (O3-8) 30 (O3-8) 38 (O3-8) 42 (O3-8)

Maricopa 24 (O3-8) 29 (O3-8) 31 (O3-8) 29 (O3-8) 33 (O3-8) 40 (O3-8)

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) 57
Federal 2008 8-Hr Ozone 0
Federal 24-hr PM10 0

O3-8hr (ppb) 45
Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 0

PM 10 (µg/m³) 98
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 51.0
Federal 2006 24-hr PM2.5 8
State 24-hr PM10 6
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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Saturday, January 16, 2021 Page 1 of 2
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