Ozone One-Hour Maximum (PPB)

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

09/14 09/15 09/16 09/17 09/18 09/19 09/20

San Joaquin

Stockton-University 50 44 44 48 55 61

Manteca

Tracy-Airport

Stanislaus

Modesto-14th 67 56 51 50 55 57 67

Turlock 73 64 53 52 53 59 73

Merced

Merced-M St.

Merced-Coffee 73 63 56 54 53 56 57

Madera

Madera-City 67 68 59 53 53 56 58

Madera 66 63 57 49 50 54 55

Fresno

Fresno-SSP 75 73 59 51 50 57 59

Clovis 84 85 x 60 51 51 56 58

Fresno-Garland 77 77 56 47 47 52 55

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 82 97 x 65 51 51 58 58

Parlier 96 92 x 69 55 59 59 64

Tranquillity 56 59 49 43 45 51 56

Huron

Kings

Hanford 69 86 63 51 47 55 61

Corcoran

Tulare

Visalia-Ashland 76 82 x 68 52 57 59 62

Porterville 79 84 x 87 x 64 60 67 68

Ash Mountain-SNP 71 82 x 87 x 64 56 65 67

Lower Kaweah-SNP 66 64 75 62 54 63 65

Kern

Shafter 72 77 63 52 48 56 61

Oildale 76 81 70 54 51 58 60

Bakersfield-Gold

Bakersfield-Calif 74 76 63 53 49 56 58

Bakersfield-Muni 85 89 71 56 52 65 63

Edison 92 107 86 x 62 59 73 72

Arvin-DiGiorgio 92 103 87 x 66 64 64 76

Maricopa 78 78 67 55 53 56 65

Lebec

District Maximum 96
107
87
66
64
73
76

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 57
Federal 1997 24-hr PM2.5 0

Federal 2008 8-Hr Ozone 35
Federal 24-hr PM10 0

O3-1hr (ppb) 109
Federal 1997 8-Hr Ozone 9
State 1-Hr Ozone 15

O3-8hr (ppb) 93
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 57

PM 10 (µg/m³) 144
Federal 2006 24-hr PM2.5 3
State 24-hr PM10 108

PM 2.5 (µg/m³) 40.6
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, September 21, 2023 Page 1 of 1