Daily Report

Ozone One-Hour Maximum (PPB)

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

10/05 10/06 10/07 10/08 10/09 10/10 10/11

San Joaquin

Stockton-University 56 60 53 55 47 41 39

Manteca

Tracy-Airport 65 66 64 64 63 49 44

Stanislaus

Modesto-14th 66 72 61 68 66 51 44

Turlock 75 79 62 75 70 59 49

Merced

Merced-M St.

Merced-Vierra 81 75 70 78 71 49 46

Madera

Madera-City 79 80 83 90 80 49 45

Madera 85 79 82 90 78 48 46

Fresno

Fresno-SSP 80 90 86 81 50 46

Clovis 83 95 93 82 79 56 48

Fresno-Garland 76 89 93 79 73 51 44

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 72 83 92 82 72 53 45

Parlier 83 90 85 80 76 59 50

Tranquillity 75 70 65 73 61 44 42

Huron

Kings

Hanford 83 74 90 86 68 61 44

Corcoran

Tulare

Visalia-Ashland 91 85

Porterville 84 84 91 91 84 55 52

Ash Mountain-SNP 66 79 83 68 87 54 59

Kern

Shafter 65 78 67 68 57 48 44

Oildale 76 86 91 70 57 53

Bakersfield-Gold

Bakersfield-Calif 64 77 76 75 67 50 47

Bakersfield-Muni 64 78 77 80 65 51 47

Edison 77 87 97 99 78 58 55

Arvin-DiGiorgio 73 86 85 82 69 55 52

Maricopa 63 73 77 73 69 51 48

Lebec

District Maximum 91 95 97 99 87 61 59
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 53
Federal 1997 24-Hr PM2.5 0
  Federal 2008 8-Hr Ozone 29
Federal 24-Hr PM10 0
  Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 15
  Federal 1-Hr Ozone 0
State 2005 8-Hr Ozone 53
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 131
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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Monday, October 12, 2026 Page 1 of 1