Daily Report

Ozone One-Hour Maximum (PPB)

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

07/17 07/18 07/19 07/20 07/21 07/22 07/23

San Joaquin

Stockton-University 48 46 48 48 59 34 39

Manteca

Tracy-Airport 42 49 47 52 65 37 40

Stanislaus

Modesto-14th 61 58 59 64 69 47 53

Turlock 65 59 59 67 65 52 53

Merced

Merced-M St.

Merced-Vierra 63 57 60 57 51 48 58

Madera

Madera-City 64 58 62 55 57 52 59

Madera 59 56 59 59 64 52 57

Fresno

Fresno-SSP 65 58 59 56 65 51 61

Clovis 80 57 69 68 60 53 57

Fresno-Garland 65 54 55 60 61 50 57

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 65 58 59 62 61 52 59

Parlier 70 63 62 73 61 58 61

Tranquillity 65 56 60 58 52 48 53

Huron

Kings

Hanford 60 56 58 52 57 55 55

Corcoran

Tulare

Visalia-Ashland 61 59 70 69 62 64 67

Porterville 64 67 66 60 55 66 70

Ash Mountain-SNP 70 77 78 73 64 62 83x

Kern

Shafter 71 70 69 58 62 55 64

Oildale 60 64 62 61 54 57 63

Bakersfield-Gold

Bakersfield-Calif 67 68 63 57 59 54 59

Bakersfield-Muni 71 67 60 57 55 52 58

Edison 80 85 73 78 65 64 78

Arvin-DiGiorgio 77 71 63 70 57

Maricopa 61 65 65 63 64 49 52

Lebec

District Maximum 80 85 78 78 69 66 83
Maximum Measured
Value for This Year
 
PollutantMaximum
O3-1hr (ppb)98
O3-8hr (ppb)84
PM 10 (µg/m³)94
PM 2.5 (µg/m³)49.5
Unofficial Days Over the Federal and State Standards¹
 
Federal 2015 8-Hr Ozone 29
Federal 1997 24-Hr PM2.5 0
  Federal 2008 8-Hr Ozone 12
Federal 24-Hr PM10 0
  Federal 1997 8-Hr Ozone 3
State 1-Hr Ozone 5
  Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 3
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 58
¹Data affected by smoke, high winds, fireworks, 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, July 24, 2026 Page 1 of 1