Daily Report

Ozone Eight-Hour Maximum (PPB)

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

07/15 07/16 07/17 07/18 07/19 07/20 07/21

San Joaquin

Stockton-University 39 39 43 42 44 45 50

Manteca

Tracy-Airport 42 42 38 43 43 46 57

Stanislaus

Modesto-14th 52 48 54 55 54 57 60

Turlock 54 49 58 56 56 59 61

Merced

Merced-M St.

Merced-Vierra 49 49 59 53 55 52 41

Madera

Madera-City 52 48 61 54 56 52 45

Madera 52 48 58 53 55 52 54

Fresno

Fresno-SSP 53 46 60 54 55 54 51

Clovis 55 47 65 56 59 58 54

Fresno-Garland 51 46 59 52 53 52 52

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 56 50 61 56 57 55 54

Parlier 60 54 61 57 58 60 49

Tranquillity 47 46 57 51 55 52 48

Huron

Kings

Hanford 53 44 56 54 56 47 54

Corcoran

Tulare

Visalia-Ashland 64 61 56 57 60 58 55

Porterville 65 64 58 60 62 56 51

Ash Mountain-SNP 69 66 65 71 71 65 60

Kern

Shafter 55 50 60 61 60 51 55

Oildale 56 51 56 61 58 56 49

Bakersfield-Gold

Bakersfield-Calif 55 50 60 60 58 55 51

Bakersfield-Muni 52 47 58 60 57 55 49

Edison 63 56 65 69 66 67 56

Arvin-DiGiorgio 59 49 63 61 58 59 50

Maricopa 52 46 58 59 62 58 60

Lebec

District Maximum 69 66 65 71 71 67 61
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 56
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, July 22, 2026 Page 1 of 1