Daily Report

Ozone Eight-Hour Maximum (PPB)

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

09/15 09/16 09/17 09/18 09/19 09/20 09/21

San Joaquin

Stockton-University 51 33 36 40 43 35 38

Manteca

Tracy-Airport 53 37 41 48 50 39 46

Stanislaus

Modesto-14th 61 43 43 48 52 41 48

Turlock 62 49 44 48 54 42 53

Merced

Merced-M St.

Merced-Vierra 57 41 44 48 54 46 49

Madera

Madera-City 57 48 44 49 55 52 49

Madera 58 49 44 49 54 52 51

Fresno

Fresno-SSP 57 51 44 48 54 55 48

Clovis 63 56 45 47 56 59 52

Fresno-Garland 58 53 41 45 52 53 48

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 60 59 43 48 57 56 50

Parlier 64 63 45 49 60 58 52

Tranquillity 54 43 37 43 48 45 43

Huron

Kings

Hanford 60 56 42 44 54 52 49

Corcoran

Tulare

Visalia-Ashland 65 62 47 49 62 61

Porterville 66 59 49 54 63 61 53

Ash Mountain-SNP 67 65 50 55 63 66 59

Kern

Shafter 61 54 44 48 62 59 46

Oildale 69 61 56 57 67 73x 56

Bakersfield-Gold

Bakersfield-Calif 61 54 47 50 62 66 51

Bakersfield-Muni 59 55 46 48 59 65 52

Edison 68 58 53 56 66 68 61

Arvin-DiGiorgio 65 53 46 51 63 63 54

Maricopa 60 55 47 50 61 65 54

Lebec

District Maximum 69 65 56 57 67 73 61
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 111
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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Tuesday, September 22, 2026 Page 1 of 1