Daily Report

Ozone Eight-Hour Maximum (PPB)

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

07/17 07/18 07/19 07/20 07/21 07/22 07/23

San Joaquin

Stockton-University 43 42 44 45 50 31 35

Manteca

Tracy-Airport 38 43 43 46 57 35 38

Stanislaus

Modesto-14th 54 55 54 57 60 43 44

Turlock 58 56 56 59 61 46 47

Merced

Merced-M St.

Merced-Vierra 59 53 55 52 41 44 52

Madera

Madera-City 61 54 56 52 45 47 54

Madera 58 53 55 52 54 47 50

Fresno

Fresno-SSP 60 54 55 54 51 46 53

Clovis 65 56 59 58 54 47 51

Fresno-Garland 59 52 53 52 52 44 50

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 61 56 57 55 54 47 54

Parlier 61 57 58 60 49 50 55

Tranquillity 57 51 55 52 48 40 47

Huron

Kings

Hanford 56 54 56 47 54 47 50

Corcoran

Tulare

Visalia-Ashland 56 57 60 58 55 54 61

Porterville 58 60 62 56 51 53 59

Ash Mountain-SNP 65 71 71 65 60 56 73x

Kern

Shafter 60 61 60 51 55 46 54

Oildale 56 61 58 56 49 49 55

Bakersfield-Gold

Bakersfield-Calif 60 60 58 55 51 46 53

Bakersfield-Muni 58 60 57 55 49 44 54

Edison 65 69 66 67 56 52 66

Arvin-DiGiorgio 63 61 58 59 50

Maricopa 58 59 62 58 60 46 49

Lebec

District Maximum 65 71 71 67 61 56 73
Maximum Measured
Value for This Year
 
PollutantMaximum
O3-1hr (ppb)98
O3-8hr (ppb)84
PM 10 (µg/m³)94
PM 2.5 (µg/m³)49.5
Unofficial Days Over the Federal and State Standards¹
 
Federal 2015 8-Hr Ozone 29
Federal 1997 24-Hr PM2.5 0
  Federal 2008 8-Hr Ozone 12
Federal 24-Hr PM10 0
  Federal 1997 8-Hr Ozone 3
State 1-Hr Ozone 5
  Federal 1-Hr Ozone 0
State 1997 8-Hr Ozone 3
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 58
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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Friday, July 24, 2026 Page 1 of 1