Daily Report

Ozone One-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 38 40 46 57 35 39 44

Manteca

Tracy-Airport 37 37 52 62 38 43 53

Stanislaus

Modesto-14th 50 46 50 67 50 45 51

Turlock 51 47 50 66 60 47 53

Merced

Merced-M St.

Merced-Vierra 49 46 52 61 51 50 52

Madera

Madera-City 51 49 55 60 53 48 55

Madera 51 52 56 62 53 48 54

Fresno

Fresno-SSP 50 48 58 62 59 47 53

Clovis 67 47 58 70 63 47 53

Fresno-Garland 60 45 54 61 60 44 50

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 60 50 57 63 70 47 52

Parlier 77 48 60 70 79 50 55

Tranquillity 45 45 50 58 49 42 48

Huron

Kings

Hanford 52 49 55 65 61 46 46

Corcoran

Tulare

Visalia-Ashland 66 52 57 75 68 50 53

Porterville 67 53 62 74 68 55 59

Ash Mountain-SNP 69 59 63 70 71 53 60

Kern

Shafter 53 47 52 65 57 48 54

Oildale 63 59 61 73 69 58 63

Bakersfield-Gold

Bakersfield-Calif 61 50 56 66 61 49 56

Bakersfield-Muni 55 50 54 66 60 51 54

Edison 74 56 61 78 65 56 62

Arvin-DiGiorgio 72 51 62 75 58 55 58

Maricopa 63 48 59 65 66 52 53

Lebec

District Maximum 77 59 63 78 79 58 63
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