Daily Report

Ozone One-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 35 39 44 51 40 43 43

Manteca

Tracy-Airport 38 43 53 59 43 52 53

Stanislaus

Modesto-14th 50 45 51 57 50 56 58

Turlock 60 47 53 60 52 62 62

Merced

Merced-M St.

Merced-Vierra 51 50 52 57 50 58 56

Madera

Madera-City 53 48 55 60 62 53 59

Madera 53 48 54 60 63 54 62

Fresno

Fresno-SSP 59 47 53 59 67 55 60

Clovis 63 47 53 59 70 57 54

Fresno-Garland 60 44 50 55 65 53 54

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 70 47 52 62 70 57 57

Parlier 79 50 55 70 70 59 61

Tranquillity 49 42 48 52 50 48 54

Huron

Kings

Hanford 61 46 46 60 57 56 58

Corcoran

Tulare

Visalia-Ashland 68 50 53 72 71

Porterville 68 55 59 70 72 57 67

Ash Mountain-SNP 71 53 60 73 72 65 69

Kern

Shafter 57 48 54 71 63 49 61

Oildale 69 58 63 72 80 59 65

Bakersfield-Gold

Bakersfield-Calif 61 49 56 65 77 54 60

Bakersfield-Muni 60 51 54 63 75 56 59

Edison 65 56 62 73 75 71 73

Arvin-DiGiorgio 58 55 58 73 69 64 73

Maricopa 66 52 53 66 69 59

Lebec

District Maximum 79 58 63 73 80 71 73
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