Ozone Eight-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 43 40 41 43 47 51

Manteca

Tracy-Airport

Stanislaus

Modesto-14th 62 51 47 46 49 54 61

Turlock 65 56 49 49 50 54 64

Merced

Merced-M St.

Merced-Coffee 70 56 52 49 50 52 54

Madera

Madera-City 65 61 54 49 48 53 55

Madera 62 59 52 46 45 49 54

Fresno

Fresno-SSP 70 67 54 48 47 52 55

Clovis 70 72 x 55 48 47 50 55

Fresno-Garland 65 67 51 45 44 48 51

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 73 82 x 57 49 48 53 56

Parlier 73 77 x 62 50 49 53 58

Tranquillity 54 53 45 41 42 47 51

Huron

Kings

Hanford 64 67 56 47 44 51 56

Corcoran

Tulare

Visalia-Ashland 68 72 x 62 50 50 55 59

Porterville 70 76 x 75 x 59 52 59 64

Ash Mountain-SNP 67 74 x 76 x 60 52 59 62

Lower Kaweah-SNP 60 59 65 56 47 55 58

Kern

Shafter 66 67 56 48 46 50 58

Oildale 70 77 65 51 48 55 58

Bakersfield-Gold

Bakersfield-Calif 69 72 60 49 47 53 56

Bakersfield-Muni 75 79 65 51 49 58 59

Edison 75 87 77 x 57 53 60 64

Arvin-DiGiorgio 77 88 76 x 59 54 56 66

Maricopa 61 72 64 51 48 53 60

Lebec

District Maximum 77
88
77
60
54
60
66

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