Daily Report

Ozone Eight-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 36 42 44 47 47 43 36

Manteca

Tracy-Airport 31 40 44 49 49 45 33

Stanislaus

Modesto-14th 45 52 57 59 62 54 46

Turlock 47 53 58 64 63 61 50

Merced

Merced-M St.

Merced-Vierra 48 51 55 59 62 59 45

Madera

Madera-City 51 53 58 57 64 67 54

Madera 50 53 57 57 63 67 55

Fresno

Fresno-SSP 52 54 59 57 65 71 57

Clovis 53 54 64 70 75 62

Fresno-Garland 52 59 55 65 74 59

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 55 60 62 61 67 75 66

Parlier 56 59 62 60 69 81 69

Tranquillity 46 50 53 54 61 58 50

Huron

Kings

Hanford 52 55 59 57 64 65 57

Corcoran

Tulare

Visalia-Ashland 61 65 65 71x 70

Porterville 61 62 68 64 68 72 69

Ash Mountain-SNP 60 67 78 73 77x 78 78

Kern

Shafter 56 59 62 62 67 67 61

Oildale 66 67 76 70 78x 77 70

Bakersfield-Gold

Bakersfield-Calif 50 53 55 55 63 58

Bakersfield-Muni 55 59 65 60 67 68 63

Edison 63 67 78 71 78x 80 73

Arvin-DiGiorgio 56 60 66 63 68 72 71

Maricopa 54 57 62 61 65 70 62

Lebec

District Maximum 66 67 78 73 78 81 78
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