Daily Report

Ozone Eight-Hour Maximum (PPB)

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

08/26 08/27 08/28 08/29 08/30 08/31 09/01

San Joaquin

Stockton-University 40 40 38 39 40 32 36

Manteca

Tracy-Airport 44 39 35 35 37 30 32

Stanislaus

Modesto-14th 49 46 46 46 48 41 43

Turlock 51 46 44 49 51 47 46

Merced

Merced-M St.

Merced-Vierra 46 35 47 49 46 55 44

Madera

Madera-City 51 41 48 50 48 59 45

Madera 53 35 43 53 48 61 45

Fresno

Fresno-SSP 56 47 39 58 48 58 46

Clovis 62 51 43 64 54 61 49

Fresno-Garland 60 45 41 61 49 55 45

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 65 44 43 66 54 57 48

Parlier 67 39 52 65 59 58 51

Tranquillity 43 33 42 48 45 48 42

Huron

Kings

Hanford 57 36 49 60 51 55 51

Corcoran

Tulare

Visalia-Ashland 73x 38 62 66 57 65 54

Porterville 65 30 67 55 56 61 55

Ash Mountain-SNP 69 54 69 77 64 68 49

Kern

Shafter 48 32 62 51 56 54 50

Oildale 63 47 77 62 62 61 59

Bakersfield-Gold

Bakersfield-Calif 51 37 60 47 51 50 53

Bakersfield-Muni 62 42 67 53 56 53 55

Edison 66 44 78 60 65 61 63

Arvin-DiGiorgio 61 41 69 52 58 56 55

Maricopa 50 44 60 52 58 59 51

Lebec

District Maximum 73 54 78 77 65 68 63
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 8
  Federal 1-Hr Ozone 0
State 2005 8-Hr Ozone 43
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 92
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, September 2, 2026 Page 1 of 1