Daily Report

Ozone Eight-Hour Maximum (PPB)

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

09/16 09/17 09/18 09/19 09/20 09/21 09/22

San Joaquin

Stockton-University 33 36 40 43 35 38 39

Manteca

Tracy-Airport 37 41 48 50 39 46 43

Stanislaus

Modesto-14th 43 43 48 52 41 48 49

Turlock 49 44 48 54 42 53 57

Merced

Merced-M St.

Merced-Vierra 41 44 48 54 46 49 51

Madera

Madera-City 48 44 49 55 52 49 53

Madera 49 44 49 54 52 51 53

Fresno

Fresno-SSP 51 44 48 54 55 48 52

Clovis 56 45 47 56 59 52 52

Fresno-Garland 53 41 45 52 53 48 50

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 59 43 48 57 56 50 53

Parlier 63 45 49 60 58 52 54

Tranquillity 43 37 43 48 45 43 47

Huron

Kings

Hanford 56 42 44 54 52 49 55

Corcoran

Tulare

Visalia-Ashland 62 47 49 62 61

Porterville 59 49 54 63 61 53 61

Ash Mountain-SNP 65 50 55 63 66 59 61

Kern

Shafter 54 44 48 62 59 46 56

Oildale 61 56 57 67 73x 56 64

Bakersfield-Gold

Bakersfield-Calif 54 47 50 62 66 51 55

Bakersfield-Muni 55 46 48 59 65 52 54

Edison 58 53 56 66 68 61 61

Arvin-DiGiorgio 53 46 51 63 63 54 60

Maricopa 55 47 50 61 65 54

Lebec

District Maximum 65 56 57 67 73 61 64
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 45
Federal 1997 24-Hr PM2.5 0
  Federal 2008 8-Hr Ozone 22
Federal 24-Hr PM10 0
  Federal 1997 8-Hr Ozone 0
State 1-Hr Ozone 10
  Federal 1-Hr Ozone 0
State 2005 8-Hr Ozone 45
  Federal 2006 24-Hr PM2.5 14
State 24-Hr PM10 112
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 23, 2026 Page 1 of 1