Daily Report

Ozone Eight-Hour Maximum (PPB)

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

09/12 09/13 09/14 09/15 09/16 09/17 09/18

San Joaquin

Stockton-University 34 37 40 51 33 36 40

Manteca

Tracy-Airport 34 35 47 53 37 41 48

Stanislaus

Modesto-14th 43 44 45 61 43 43 48

Turlock 45 44 46 62 49 44 48

Merced

Merced-M St.

Merced-Vierra 42 43 48 57 41 44 48

Madera

Madera-City 47 45 51 57 48 44 49

Madera 46 47 49 58 49 44 49

Fresno

Fresno-SSP 47 45 52 57 51 44 48

Clovis 55 44 53 63 56 45 47

Fresno-Garland 51 43 50 58 53 41 45

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 53 46 52 60 59 43 48

Parlier 61 44 54 64 63 45 49

Tranquillity 40 42 44 54 43 37 43

Huron

Kings

Hanford 48 45 51 60 56 42 44

Corcoran

Tulare

Visalia-Ashland 59 47 53 65 62 47 49

Porterville 57 49 55 66 59 49 54

Ash Mountain-SNP 61 53 59 67 65 50 55

Kern

Shafter 49 44 49 61 54 44 48

Oildale 60 54 57 69 61 56 57

Bakersfield-Gold

Bakersfield-Calif 56 47 52 61 54 47 50

Bakersfield-Muni 52 45 51 59 55 46 48

Edison 60 52 57 68 58 53 56

Arvin-DiGiorgio 60 45 55 65 53 46 51

Maricopa 59 44 53 60 55 47 50

Lebec

District Maximum 61 54 59 69 65 56 57
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 108
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, September 19, 2026 Page 1 of 1