Daily Report

Ozone Eight-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 36 48 43 39 40 40 38

Manteca

Tracy-Airport 37 42 42 38 44 39 35

Stanislaus

Modesto-14th 43 52 55 46 49 46 46

Turlock 48 54 62 52 51 46 44

Merced

Merced-M St.

Merced-Vierra 46 53 58 47 46 35 47

Madera

Madera-City 47 50 52 53 51 41 48

Madera 48 53 54 53 35 43

Fresno

Fresno-SSP 47 50 56 60 56 47 39

Clovis 48 55 62 65 62 51 43

Fresno-Garland 46 52 54 61 60 45 41

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 51 58 55 69 65 44 43

Parlier 52 57 59 67 39 52

Tranquillity 41 48 50 47 43 33 42

Huron

Kings

Hanford 50 49 56 58 57 36 49

Corcoran

Tulare

Visalia-Ashland 64 56 66 81 73x 38 62

Porterville 59 57 66 70 65 30 67

Ash Mountain-SNP 75 65 72 79 69 54 69

Kern

Shafter 50 60 57 58 48 32 62

Oildale 58 69 62 69 63 47 77

Bakersfield-Gold

Bakersfield-Calif 47 59 53 56 51 37 60

Bakersfield-Muni 51 63 56 61 62 42 67

Edison 60 67 65 66 66 44 78

Arvin-DiGiorgio 55 61 60 61 61 41 69

Maricopa 49 62 60 57 50 44 60

Lebec

District Maximum 75 69 72 81 73 54 78
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