Ozone Eight-Hour Maximum (PPB)

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

04/17 04/18 04/19 04/20 04/21 04/22 04/23

San Joaquin

Stockton-University 43 45 44 41 42 45 42

Manteca

Tracy-Airport 34 40 42 41 34 42 35

Stanislaus

Modesto-14th 48 50 53 45 49 53 47

Turlock 51 52 58 46 50 57 43

Merced

Merced-M St.

Merced-Vierra 45 51 59 44 45 48 43

Madera

Madera-City 50 51 57 44 42 53 47

Madera 49 51 58 46 42 53 47

Fresno

Fresno-SSP 50 51 56 45 44 54 47

Clovis 50 56 54 44 48 68 53

Fresno-Garland 46 51 49 41 43 56 47

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 52 54 58 47 49 57 51

Parlier 57 55 58 54 49 61 49

Tranquillity 42 45 56 37 40 42 40

Huron

Kings

Hanford 56 58 61 49 49 55 46

Corcoran

Tulare

Visalia-Ashland 58 55 57 58 49 63 47

Porterville 61 58 55 59 48 57 48

Ash Mountain-SNP 42 45 48 49 42 53 46

Lower Kaweah-SNP 46 43 47 47 54 56 47

Kern

Shafter 59 56 59 57 46 53 46

Oildale 64 58 58 62 52 58 48

Bakersfield-Gold

Bakersfield-Calif 60 55 58 61 54 57 47

Bakersfield-Muni 60 54 55 60 54 55 45

Edison 68 61 59 65 60 64 49

Arvin-DiGiorgio 67 58 58 64 55 62 51

Maricopa 60 55 53 56 48 54 48

Lebec

District Maximum 68
61
61
65
60
68
53

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum Federal 2015 8-Hr Ozone 1
Federal 1997 24-hr PM2.5 0

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

O3-1hr (ppb) 82
Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 0

O3-8hr (ppb) 71
Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 1

PM 10 (µg/m³) 72
Federal 2006 24-hr PM2.5 0
State 24-hr PM10 6

PM 2.5 (µg/m³) 32.2
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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Wednesday, April 24, 2024 Page 1 of 1