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.

05/01
05/02
05/03
05/04
05/05
05/06
05/07

San Joaquin

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

Manteca 80 (PM10) 51 (PM10) 44 (PM10) 31 (PM10) 38 (PM25) 63 (PM10) 22 (PM10)

Tracy-Airport 36 (O3-8) 40 (O3-8) 50 (O3-8) 45 (O3-8) 61 (O3-8) 38 (O3-8) 42 (O3-8)

Stanislaus

Modesto-14th 41 (O3-8) 44 (O3-8) 50 (O3-8) 50 (PM25) 100 (O3-8) 42 (O3-8) 44 (O3-8)

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

Merced

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

Merced-Coffee 44 (O3-8) 43 (O3-8) 50 (O3-8) 54 (O3-8) 90 (O3-8) 46 (O3-8) 46 (O3-8)

Madera

Madera-City 43 (O3-8) 44 (O3-8) 49 (O3-8) 61 (O3-8) 87 (O3-8) 49 (O3-8) 48 (O3-8)

Madera 41 (O3-8) 43 (O3-8) 48 (O3-8) 50 (O3-8) 87 (O3-8) 46 (O3-8) 47 (O3-8)

Fresno

Fresno-SSP 41 (O3-8) 40 (O3-8) 47 (O3-8) 51 (O3-8) 90 (O3-8) 45 (O3-8) 46 (O3-8)

Clovis 40 (O3-8) 39 (O3-8) 46 (PM25) 61 (O3-8) 87 (O3-8) 44 (O3-8) 45 (O3-8)

Fresno-Garland 36 (O3-8) 36 (O3-8) 43 (O3-8) 46 (PM25) 67 (O3-8) 42 (O3-8) 43 (O3-8)

Fresno-Foundry 21 (PM25) 29 (PM25) 42 (PM25) 55 (PM25) 57 (PM25) 29 (PM25) 25 (PM25)

Fresno-Pacific 13 (PM25) 21 (PM25) 25 (PM25) 42 (PM25) 50 (PM25) 17 (PM25) 25 (PM25)

Fresno-Drummond 44 (O3-8) 43 (O3-8) 49 (O3-8) 67 (O3-8) 105 (O3-8) 51 (O3-8) 50 (O3-8)

Parlier 46 (O3-8) 41 (O3-8) 54 (O3-8) 74 (O3-8) 80 (O3-8) 51 (O3-8) 51 (O3-8)

Tranquillity 34 (O3-8) 40 (O3-8) 45 (O3-8) 44 (O3-8) 54 (O3-8) 43 (O3-8) 42 (O3-8)

Huron 13 (PM25) 13 (PM25) 29 (PM25) 25 (PM25) 33 (PM25) 25 (PM25) 17 (PM25)

Kings

Hanford 42 (O3-8) 50 (PM10) 48 (O3-8) 52 (PM10) 50 (PM25) 38 (PM25) 35 (PM10)

Corcoran 40 (PM10) 52 (PM10) 46 (PM10) 53 (PM10) 46 (PM10) 56 (PM10) 37 (PM10)

Tulare

Visalia, Church 44 (O3-8) 38 (PM10) 44 (O3-8) 55 (PM25) 62 (PM25) 50 (PM25) 44 (O3-8)

Porterville 71 (O3-8) 44 (O3-8) 51 (O3-8) 90 (O3-8) 100 (O3-8) 74 (O3-8) 50 (O3-8)

Ash Mountain-SNP 93 (O3-8) 44 (O3-8) 50 (O3-8) 101 (O3-8) 100 (O3-8) 105 (O3-8) 49 (O3-8)

Lower Kaweah-SNP 87 (O3-8) 44 (O3-8) 46 (O3-8) 84 (O3-8) 84 (O3-8) 101 (O3-8) 45 (O3-8)

Kern

Shafter 44 (O3-8) 39 (O3-8) 41 (O3-8) 47 (O3-8) 67 (O3-8) 51 (O3-8) 42 (O3-8)

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

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

Bakersfield-Calif 44 (O3-8) 35 (O3-8) 41 (O3-8) 48 (O3-8) 53 (PM25) 49 (O3-8) 41 (O3-8)

Bakersfield-Muni 51 (O3-8) 41 (O3-8) 45 (O3-8) 77 (O3-8) 67 (O3-8) 74 (O3-8) 45 (O3-8)

Edison 71 (O3-8) 44 (O3-8) 50 (O3-8) 97 (O3-8) 90 (O3-8) 90 (O3-8) 49 (O3-8)

Arvin-DiGiorgio 54 (O3-8) 40 (O3-8) 47 (O3-8) 80 (O3-8) 74 (O3-8) 74 (O3-8) 44 (O3-8)

Maricopa 45 (O3-8) 35 (O3-8) 42 (O3-8) 50 (O3-8) 47 (O3-8) 48 (O3-8) 38 (O3-8)

Lebec 17 (PM25) 17 (PM25) 13 (PM25) 29 (PM25) 17 (PM25) 29 (PM25) 21 (PM25)

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 5
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 5

PM 2.5 (µg/m³) 63.5
Federal 2006 24-hr PM2.5 15
State 24-hr PM10 42
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, May 8, 2021 Page 1 of 1