Daily Report

Ozone One-Hour Maximum (PPB)

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

08/15 08/16 08/17 08/18 08/19 08/20 08/21

San Joaquin

Stockton-University 42 46 48 52 53 53 44

Manteca

Tracy-Airport 36 45 51 54 56 49 38

Stanislaus

Modesto-14th 47 59 64 64 67 60 54

Turlock 52 61 65 68 75 67 57

Merced

Merced-M St.

Merced-Vierra 53 55 62 63 66 64 52

Madera

Madera-City 55 57 61 61 69 72 58

Madera 54 59 60 62 69 72 60

Fresno

Fresno-SSP 55 58 61 62 68 79 63

Clovis 56 56 73 86 94 75

Fresno-Garland 19 55 66 60 74 87 63

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 60 65 68 66 71 85 73

Parlier 60 66 67 67 77 93 83

Tranquillity 52 55 58 58 64 67 54

Huron

Kings

Hanford 56 61 65 61 67 68 61

Corcoran

Tulare

Visalia-Ashland 65 70 69 77x 76

Porterville 65 69 74 68 77 80 74

Ash Mountain-SNP 67 72 83 80 87x 88 85

Kern

Shafter 64 68 66 68 69 76 71

Oildale 70 73 80 77 90x 85 80

Bakersfield-Gold

Bakersfield-Calif 55 57 60 60 68 64

Bakersfield-Muni 59 63 69 64 76 75 68

Edison 66 76 92 86 93x 101 93

Arvin-DiGiorgio 62 70 75 71 84 85 82

Maricopa 59 61 65 64 72 75 66

Lebec

District Maximum 70 76 92 86 93 101 93
Maximum Measured
Value for This Year
 
PollutantMaximum
O3-1hr (ppb)101
O3-8hr (ppb)84
PM 10 (µg/m³)116
PM 2.5 (µg/m³)49.5
Unofficial Days Over the Federal and State Standards¹
 
Federal 2015 8-Hr Ozone 39
Federal 1997 24-Hr PM2.5 0
  Federal 2008 8-Hr Ozone 19
Federal 24-Hr PM10 0
  Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 8
  Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 0
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 82
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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Saturday, August 22, 2026 Page 1 of 1