Ozone Eight-Hour Maximum (PPB)

The information in this report is based on preliminary data and is subject to change.

09/10 09/11 09/12 09/13 09/14 09/15 09/16

San Joaquin

Stockton-Hazelton 34 47 52 52 53 43 42

Manteca

Tracy-Airport 31 48 54 58 61 50 49

Stanislaus

Modesto-14th 48 53 60 63 61 58 56

Turlock 50 55 61 67 75 61 58

Merced

Merced-M St.

Merced-Coffee 53 55 56 65 67 59 59

Madera

Madera-City 60 55 59 68 73 63 62

Madera 55 49 55 64 68 58 60

Fresno

Fresno-SSP 53 51 55 63 71 60 65

Clovis 57 53 60 68 71 65 71

Fresno-Garland 53 50 57 67 69 60 67

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 57 57 64 72 78 64 80

Parlier 56 59 67 68 75 58 77

Tranquillity 50 43 50 62 59 53

Huron

Kings

Hanford 52 48 55 64 73 60 63

Corcoran

Tulare

Visalia, Church 62 62 67 70 77 64 75

Porterville 63 59 65 67 75 73

Ash Mountain-SNP 73 67 71 59

Lower Kaweah-SNP 68 61 66 55 60

Kern

Shafter 54 47 56 60 68 62 59

Oildale 65 65 66 67 73 70 68

Bakersfield-Gold

Bakersfield-Calif 53 53 55 58 61 60 57

Bakersfield-Muni 56 58 60 59 63 63 59

Edison 67 64 68 67 76 71 70

Arvin-DiGiorgio 68 64 66 63 70 66 68

Maricopa 55 46 53 59 70

Lebec

District Maximum 73
67
71
72
78
71
80

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 93
Federal 1997 24-hr PM2.5 0

Federal 2008 8-Hr Ozone 70
Federal 24-hr PM10 0

O3-1hr (ppb) 116
Federal 1997 8-Hr Ozone 16
State 1-Hr Ozone 36

O3-8hr (ppb) 100
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 93

PM 10 (µg/m³) 149
Federal 2006 24-hr PM2.5 15
State 24-hr PM10 148

PM 2.5 (µg/m³) 63.5
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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Friday, September 17, 2021 Page 1 of 1