Daily Report

Ozone One-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 57 35 39 44 51 40 43

Manteca

Tracy-Airport 62 38 43 53 59 43 52

Stanislaus

Modesto-14th 67 50 45 51 57 50 56

Turlock 66 60 47 53 60 52 62

Merced

Merced-M St.

Merced-Vierra 61 51 50 52 57 50 58

Madera

Madera-City 60 53 48 55 60 62 53

Madera 62 53 48 54 60 63 54

Fresno

Fresno-SSP 62 59 47 53 59 67 55

Clovis 70 63 47 53 59 70 57

Fresno-Garland 61 60 44 50 55 65 53

Fresno-Foundry

Fresno-Pacific

Fresno-Drummond 63 70 47 52 62 70 57

Parlier 70 79 50 55 70 70 59

Tranquillity 58 49 42 48 52 50 48

Huron

Kings

Hanford 65 61 46 46 60 57 56

Corcoran

Tulare

Visalia-Ashland 75 68 50 53 72 71

Porterville 74 68 55 59 70 72 57

Ash Mountain-SNP 70 71 53 60 73 72 65

Kern

Shafter 65 57 48 54 71 63 49

Oildale 73 69 58 63 72 80 59

Bakersfield-Gold

Bakersfield-Calif 66 61 49 56 65 77 54

Bakersfield-Muni 66 60 51 54 63 75 56

Edison 78 65 56 62 73 75 71

Arvin-DiGiorgio 75 58 55 58 73 69 64

Maricopa 65 66 52 53 66 69 59

Lebec

District Maximum 78 79 58 63 73 80 71
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.
Make one change for clean air! Visit www.valleyair.org/hal and become a part of the solution!
Tuesday, September 22, 2026 Page 1 of 1