Daily Report

Ozone One-Hour Maximum (PPB)

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

07/15 07/16 07/17 07/18 07/19 07/20 07/21

San Joaquin

Stockton-University 42 42 48 46 48 48 59

Manteca

Tracy-Airport 48 44 42 49 47 52 65

Stanislaus

Modesto-14th 58 52 61 58 59 64 69

Turlock 62 55 65 59 59 67 65

Merced

Merced-M St.

Merced-Vierra 55 54 63 57 60 57 51

Madera

Madera-City 56 56 64 58 62 55 57

Madera 56 55 59 56 59 59 64

Fresno

Fresno-SSP 57 51 65 58 59 56 65

Clovis 60 50 80 57 69 68 60

Fresno-Garland 56 49 65 54 55 60 61

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 63 54 65 58 59 62 61

Parlier 79 64 70 63 62 73 61

Tranquillity 51 58 65 56 60 58 52

Huron

Kings

Hanford 56 47 60 56 58 52 57

Corcoran

Tulare

Visalia-Ashland 80 70 61 59 70 69 62

Porterville 78 72 64 67 66 60 55

Ash Mountain-SNP 78 76 70 77 78 73 64

Kern

Shafter 68 60 71 70 69 58 62

Oildale 61 58 60 64 62 61 54

Bakersfield-Gold

Bakersfield-Calif 61 56 67 68 63 57 59

Bakersfield-Muni 56 52 71 67 60 57 55

Edison 73 59 80 85 73 78 65

Arvin-DiGiorgio 73 51 77 71 63 70 57

Maricopa 56 49 61 65 65 63 64

Lebec

District Maximum 80 76 80 85 78 78 69
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 56
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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Wednesday, July 22, 2026 Page 1 of 1