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.

04/29
04/30
05/01
05/02
05/03
05/04
05/05

San Joaquin

Stockton-Hazelton 50 (PM25) 50 (PM25) 42 (PM25) 53 (PM25) 50 (PM25) 53 (PM25) 59 (PM25)

Manteca 26 (PM10) 30 (PM10) 80 (PM10) 51 (PM10) 44 (PM10) 31 (PM10) 38 (PM25)

Tracy-Airport 67 (O3-8) 46 (O3-8) 36 (O3-8) 40 (O3-8) 50 (O3-8) 45 (O3-8) 61 (O3-8)

Stanislaus

Modesto-14th 90 (O3-8) 67 (O3-8) 41 (O3-8) 44 (O3-8) 50 (O3-8) 50 (PM25) 100 (O3-8)

Turlock 84 (O3-8) 77 (O3-8) 44 (O3-8) 43 (O3-8) 49 (O3-8) 58 (O3-8) 112 (O3-8)

Merced

Merced-M St. 25 (PM25) 25 (PM25) 17 (PM25) 21 (PM25) 25 (PM25) 29 (PM25) 33 (PM25)

Merced-Coffee 71 (O3-8) 77 (O3-8) 44 (O3-8) 43 (O3-8) 50 (O3-8) 54 (O3-8) 90 (O3-8)

Madera

Madera-City 101 (O3-8) 97 (O3-8) 43 (O3-8) 44 (O3-8) 49 (O3-8) 61 (O3-8) 87 (O3-8)

Madera 90 (O3-8) 90 (O3-8) 41 (O3-8) 43 (O3-8) 48 (O3-8) 50 (O3-8) 87 (O3-8)

Fresno

Fresno-SSP 97 (O3-8) 90 (O3-8) 41 (O3-8) 40 (O3-8) 47 (O3-8) 51 (O3-8) 90 (O3-8)

Clovis 90 (O3-8) 80 (O3-8) 40 (O3-8) 39 (O3-8) 46 (PM25) 61 (O3-8) 87 (O3-8)

Fresno-Garland 80 (O3-8) 67 (O3-8) 36 (O3-8) 36 (O3-8) 43 (O3-8) 46 (PM25) 67 (O3-8)

Fresno-Foundry 55 (PM25) 57 (PM25) 21 (PM25) 29 (PM25) 42 (PM25) 55 (PM25) 57 (PM25)

Fresno-Pacific 38 (PM25) 42 (PM25) 13 (PM25) 21 (PM25) 25 (PM25) 42 (PM25) 50 (PM25)

Fresno-Drummond 105 (O3-8) 115 (O3-8) 44 (O3-8) 43 (O3-8) 49 (O3-8) 67 (O3-8) 105 (O3-8)

Parlier 97 (O3-8) 101 (O3-8) 46 (O3-8) 41 (O3-8) 54 (O3-8) 74 (O3-8) 80 (O3-8)

Tranquillity 54 (O3-8) 71 (O3-8) 34 (O3-8) 40 (O3-8) 45 (O3-8) 44 (O3-8) 54 (O3-8)

Huron 21 (PM25) 29 (PM25) 13 (PM25) 13 (PM25) 29 (PM25) 25 (PM25) 33 (PM25)

Kings

Hanford 84 (O3-8) 101 (O3-8) 42 (O3-8) 50 (PM10) 48 (O3-8) 52 (PM10) 50 (PM25)

Corcoran 43 (PM10) 49 (PM10) 40 (PM10) 52 (PM10) 46 (PM10) 53 (PM10) 46 (PM10)

Tulare

Visalia, Church 67 (O3-8) 74 (O3-8) 44 (O3-8) 38 (PM10) 44 (O3-8) 55 (PM25) 62 (PM25)

Porterville 100 (O3-8) 115 (O3-8) 71 (O3-8) 44 (O3-8) 51 (O3-8) 90 (O3-8) 100 (O3-8)

Ash Mountain-SNP 74 (O3-8) 122 (O3-8) 93 (O3-8) 44 (O3-8) 50 (O3-8) 101 (O3-8) 100 (O3-8)

Lower Kaweah-SNP 54 (O3-8) 100 (O3-8) 87 (O3-8) 44 (O3-8) 46 (O3-8) 84 (O3-8) 84 (O3-8)

Kern

Shafter 80 (O3-8) 80 (O3-8) 44 (O3-8) 39 (O3-8) 41 (O3-8) 47 (O3-8) 67 (O3-8)

Oildale 43 (O3-8) 50 (PM10) 39 (O3-8) 38 (PM10) 41 (O3-8)

Bakersfield-Gold 46 (PM25) 68 (PM25) 42 (PM25) 33 (PM25) 38 (PM25) 53 (PM25) 53 (PM25)

Bakersfield-Calif 64 (O3-8) 77 (O3-8) 44 (O3-8) 35 (O3-8) 41 (O3-8) 48 (O3-8) 53 (PM25)

Bakersfield-Muni 100 (O3-8) 119 (O3-8) 51 (O3-8) 41 (O3-8) 45 (O3-8) 77 (O3-8) 67 (O3-8)

Edison 112 (O3-8) 133 (O3-8) 71 (O3-8) 44 (O3-8) 50 (O3-8) 97 (O3-8) 90 (O3-8)

Arvin-DiGiorgio 97 (O3-8) 119 (O3-8) 54 (O3-8) 40 (O3-8) 47 (O3-8) 80 (O3-8) 74 (O3-8)

Maricopa 74 (O3-8) 67 (O3-8) 45 (O3-8) 35 (O3-8) 42 (O3-8) 50 (O3-8) 47 (O3-8)

Lebec 29 (PM25) 38 (PM25) 17 (PM25) 17 (PM25) 13 (PM25) 29 (PM25) 17 (PM25)

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 4
Federal 1997 24-hr PM2.5 0

O3-1hr (ppb) 91
Federal 2008 8-Hr Ozone 1
Federal 24-hr PM10 0

O3-8hr (ppb) 80
Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 0

PM 10 (µg/m³) 115
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 4

PM 2.5 (µg/m³) 63.5
Federal 2006 24-hr PM2.5 15
State 24-hr PM10 41
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, May 6, 2021 Page 1 of 1