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.

03/18
03/19
03/20
03/21
03/22
03/23
03/24

San Joaquin

Stockton-University 69 (PM25) 41 (O3-8) 40 (O3-8) 37 (O3-8) 36 (O3-8) 39 (O3-8) 40 (O3-8)

Manteca 38 (PM25) 9 (PM25) 7 (PM10) 6 (PM10) 4 (PM25) 11 (PM25) 8 (PM10)

Tracy-Airport 38 (O3-8) 42 (O3-8) 35 (O3-8) 37 (O3-8) 31 (O3-8) 40 (O3-8) 40 (O3-8)

Stanislaus

Modesto-14th 49 (PM25) 44 (O3-8) 39 (O3-8) 40 (O3-8) 40 (O3-8) 44 (O3-8) 41 (O3-8)

Turlock 48 (PM25) 41 (O3-8) 36 (O3-8) 40 (O3-8) 39 (O3-8) 43 (O3-8) 41 (O3-8)

Merced

Merced-M St. 41 (PM25) 13 (PM25) 6 (PM10) 10 (PM25) 11 (PM25) 21 (PM25) 9 (PM25)

Merced-Coffee 42 (PM25) 40 (O3-8) 35 (O3-8) 40 (O3-8) 39 (O3-8) 39 (O3-8) 41 (O3-8)

Madera

Madera-City 42 (PM25) 38 (O3-8) 35 (O3-8) 41 (O3-8) 40 (O3-8) 37 (O3-8) 42 (O3-8)

Madera 41 (O3-8) 38 (O3-8) 35 (O3-8) 42 (O3-8) 40 (O3-8) 35 (O3-8) 42 (O3-8)

Fresno

Fresno-SSP 41 (O3-8) 38 (O3-8) 36 (O3-8) 41 (O3-8) 40 (O3-8) 36 (O3-8) 42 (O3-8)

Clovis 42 (O3-8) 37 (O3-8) 36 (O3-8) 41 (O3-8) 39 (O3-8) 35 (O3-8) 41 (O3-8)

Fresno-Garland 42 (O3-8) 44 (O3-8) 36 (O3-8) 40 (O3-8) 37 (O3-8) 35 (O3-8) 41 (O3-8)

Fresno-Foundry 55 (PM25) 18 (PM25) 11 (PM25) 11 (PM25) 6 (PM25) 22 (PM25) 15 (PM25)

Fresno-Pacific 44 (PM25) 8 (PM25) 4 (PM25) 4 (PM25) 4 (PM25)

Fresno-Drummond 41 (O3-8) 35 (O3-8) 35 (O3-8) 39 (O3-8) 37 (O3-8) 34 (O3-8) 42 (O3-8)

Parlier 44 (O3-8) 38 (O3-8) 40 (O3-8) 42 (O3-8) 41 (O3-8) 35 (O3-8) 44 (O3-8)

Tranquillity 31 (O3-8) 33 (O3-8) 28 (O3-8) 38 (O3-8) 32 (O3-8) 33 (O3-8) 39 (O3-8)

Huron 26 (PM25) 10 (PM25) 4 (PM25) 6 (PM25) 5 (PM25) 12 (PM25) 10 (PM25)

Kings

Hanford 51 (PM25) 32 (O3-8) 36 (O3-8) 39 (O3-8) 37 (O3-8) 35 (O3-8) 43 (O3-8)

Corcoran 48 (PM25) 18 (PM25) 10 (PM25) 8 (PM25) 15 (PM25) 20 (PM25) 17 (PM25)

Tulare

Visalia-Ashland 49 (PM25) 35 (O3-8) 33 (O3-8) 39 (O3-8) 40 (O3-8) 34 (O3-8) 42 (O3-8)

Porterville 44 (PM25) 36 (O3-8) 32 (O3-8) 41 (O3-8) 40 (O3-8) 34 (O3-8) 42 (O3-8)

Ash Mountain-SNP 43 (O3-8) 37 (O3-8) 37 (O3-8) 43 (O3-8) 41 (O3-8) 34 (O3-8) 38 (O3-8)

Lower Kaweah-SNP 45 (O3-8) 47 (O3-8) 44 (O3-8) 54 (O3-8) 46 (O3-8) 40 (O3-8) 40 (O3-8)

Kern

Shafter 42 (O3-8) 40 (O3-8) 32 (O3-8) 42 (O3-8) 39 (O3-8) 30 (O3-8) 43 (O3-8)

Oildale

Bakersfield-Gold 38 (PM25) 27 (PM10) 13 (PM25) 10 (PM25) 10 (PM25) 17 (PM25) 21 (PM25)

Bakersfield-Calif 37 (O3-8) 35 (O3-8) 29 (O3-8) 35 (O3-8) 34 (O3-8) 26 (O3-8) 34 (O3-8)

Bakersfield-Muni 43 (O3-8) 41 (O3-8) 34 (O3-8) 41 (O3-8) 40 (O3-8) 31 (O3-8) 40 (O3-8)

Edison 44 (O3-8) 44 (O3-8) 37 (O3-8) 41 (O3-8) 43 (O3-8) 32 (O3-8) 43 (O3-8)

Arvin-DiGiorgio 45 (O3-8) 43 (O3-8) 38 (O3-8) 42 (O3-8) 42 (O3-8) 33 (O3-8) 43 (O3-8)

Maricopa 40 (O3-8) 38 (O3-8) 32 (O3-8) 44 (O3-8) 41 (O3-8) 33 (O3-8) 42 (O3-8)

Lebec 5 (PM25) 4 (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) 95
Federal 2008 8-Hr Ozone 0
Federal 24-hr PM10 0

O3-8hr (ppb) 56
Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 1

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

PM 2.5 (µg/m³) 40.6
Federal 2006 24-hr PM2.5 3
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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Saturday, March 25, 2023 Page 1 of 1