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.

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

San Joaquin

Stockton-Hazelton 33 (O3-8) 36 (O3-8) 42 (O3-8) 46 (PM25) 61 (O3-8) 122 (O3-8) 37 (O3-8)

Manteca

Tracy-Airport 35 (O3-8) 38 (O3-8) 45 (O3-8) 54 (O3-8) 80 (O3-8) 87 (O3-8) 40 (O3-8)

Stanislaus

Modesto-14th 37 (O3-8) 40 (O3-8) 45 (O3-8) 58 (O3-8) 101 (O3-8) 136 (O3-8) 42 (O3-8)

Turlock 39 (O3-8) 43 (O3-8) 48 (O3-8) 87 (O3-8) 97 (O3-8) 115 (O3-8) 47 (O3-8)

Merced

Merced-Coffee 41 (O3-8) 42 (O3-8) 47 (O3-8) 67 (O3-8) 87 (O3-8) 105 (O3-8) 51 (O3-8)

Madera

Madera-City 44 (PM10) 42 (O3-8) 49 (O3-8) 77 (O3-8) 105 (O3-8) 119 (O3-8) 119 (O3-8)

Madera 40 (O3-8) 47 (O3-8) 74 (O3-8) 93 (O3-8) 115 (O3-8) 112 (O3-8)

Fresno

Fresno-SSP 40 (O3-8) 40 (O3-8) 49 (O3-8) 87 (O3-8) 112 (O3-8) 119 (O3-8) 119 (O3-8)

Clovis 42 (O3-8) 43 (O3-8) 51 (O3-8) 93 (O3-8) 108 (O3-8) 55 (PM25) 101 (O3-8)

Fresno-Garland 42 (O3-8) 42 (O3-8) 54 (O3-8) 97 (O3-8) 122 (O3-8) 126 (O3-8) 108 (O3-8)

Fresno-Drummond 40 (O3-8) 40 (O3-8) 51 (O3-8) 93 (O3-8) 129 (O3-8) 119 (O3-8) 97 (O3-8)

Parlier 46 (O3-8) 42 (O3-8) 67 (O3-8) 101 (O3-8) 129 (O3-8) 126 (O3-8) 93 (O3-8)

Tranquillity 36 (O3-8) 38 (O3-8) 45 (O3-8) 51 (O3-8) 74 (O3-8) 101 (O3-8) 54 (O3-8)

Huron 17 (PM25) 17 (PM25) 21 (PM25) 29 (PM25) 33 (PM25) 46 (PM25) 25 (PM25)

Kings

Hanford 48 (PM10) 41 (O3-8) 57 (PM10) 97 (O3-8) 119 (O3-8) 108 (O3-8) 74 (O3-8)

Corcoran 38 (PM10) 33 (PM10) 50 (PM10) 73 (PM10) 72 (PM10) 60 (PM10) 46 (PM25)

Tulare

Visalia, Church 56 (PM10) 46 (PM10) 58 (O3-8) 101 (O3-8) 115 (O3-8) 101 (O3-8) 74 (O3-8)

Porterville 42 (O3-8) 37 (O3-8) 46 (O3-8) 74 (O3-8) 84 (O3-8) 80 (O3-8) 51 (O3-8)

Ash Mountain-SNP 71 (O3-8) 51 (O3-8) 74 (O3-8) 93 (O3-8) 115 (O3-8) 108 (O3-8) 112 (O3-8)

Lower Kaweah-SNP 51 (O3-8) 46 (O3-8) 50 (O3-8) 67 (O3-8) 90 (O3-8) 90 (O3-8) 97 (O3-8)

Kern

Shafter 44 (O3-8) 44 (O3-8) 49 (O3-8) 90 (O3-8) 112 (O3-8) 115 (O3-8) 74 (O3-8)

Oildale 44 (O3-8) 44 (O3-8) 51 (O3-8) 97 (O3-8) 112 (O3-8) 119 (O3-8) 87 (O3-8)

Bakersfield-Calif 44 (O3-8) 43 (O3-8) 50 (O3-8) 100 (O3-8) 115 (O3-8) 122 (O3-8) 87 (O3-8)

Bakersfield-Muni 41 (O3-8) 42 (O3-8) 49 (O3-8) 93 (O3-8) 115 (O3-8) 122 (O3-8) 77 (O3-8)

Edison 48 (O3-8) 46 (O3-8) 61 (O3-8) 108 (O3-8) 136 (O3-8) 151 (O3-8) 84 (O3-8)

Arvin-DiGiorgio 45 (O3-8) 41 (O3-8) 51 (O3-8) 108 (O3-8) 129 (O3-8) 115 (O3-8) 58 (O3-8)

Maricopa 45 (O3-8) 44 (O3-8) 49 (O3-8) 101 (O3-8) 115 (O3-8) 126 (O3-8) 97 (O3-8)

Lebec 17 (PM25) 29 (PM25) 25 (PM25) 29 (PM25) 38 (PM25) 25 (PM25)

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum

PM10 Federal 24-hr 0
Federal 1-Hr Ozone 0

O3-1hr (ppb) 110

PM10 State 24-hr 76
State 1-Hr Ozone 20

O3-8hr (ppb) 93

PM2.5 Federal 2006 24-hr 10
Federal 2008 8-Hr Ozone 57

PM 10 (µg/m³) 129
PM2.5 Federal 1997 24-hr

PM2.5 Federal 1997 24-hr 0
Federal 1997 8-Hr Ozone 9

PM 2.5 (µg/m³) 53

State 1997 8-Hr Ozone 79
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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Monday, September 16, 2019 Page 1 of 1