Daily Report

Ozone One-Hour Maximum (PPB)

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

08/22 08/23 08/24 08/25 08/26 08/27 08/28

San Joaquin

Stockton-University 41 52 51 45 45 46 57

Manteca

Tracy-Airport 41 48 47 44 48 45 41

Stanislaus

Modesto-14th 48 58 61 51 58 58 56

Turlock 53 61 69 61 57 55 51

Merced

Merced-M St.

Merced-Vierra 53 56 63 54 51 44 51

Madera

Madera-City 52 53 62 58 62 49 55

Madera 49 60 61 58 44 52

Fresno

Fresno-SSP 51 54 68 68 61 54 45

Clovis 53 64 79 89 79 57 58

Fresno-Garland 50 57 64 80 79 51 50

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 56 68 64 88 87 54 55

Parlier 58 68 66 82 49 73

Tranquillity 49 56 53 50 54 37 47

Huron

Kings

Hanford 55 53 59 61 67 42 58

Corcoran

Tulare

Visalia-Ashland 70 59 70 93 84x 44 76

Porterville 68 63 73 83 77 38 72

Ash Mountain-SNP 84 71 79 89 72 61 75

Kern

Shafter 62 72 62 70 52 37 69

Oildale 66 76 71 79 84 53 81

Bakersfield-Gold

Bakersfield-Calif 52 63 59 61 60 43 65

Bakersfield-Muni 54 70 67 64 82 48 72

Edison 69 78 86 84 87 52 84

Arvin-DiGiorgio 64 69 70 73 79 49 77

Maricopa 54 68 64 62 54 46 66

Lebec

District Maximum 84 78 86 93 87 61 84
Maximum Measured
Value for This Year
 
PollutantMaximum
O3-1hr (ppb)101
O3-8hr (ppb)84
PM 10 (µg/m³)150
PM 2.5 (µg/m³)49.5
Unofficial Days Over the Federal and State Standards¹
 
Federal 2015 8-Hr Ozone 43
Federal 1997 24-Hr PM2.5 0
  Federal 2008 8-Hr Ozone 21
Federal 24-Hr PM10 0
  Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 9
  Federal 1-Hr Ozone 0
State 2005 8-Hr Ozone 43
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 89
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 29, 2026 Page 1 of 1