Daily Report

PM2.5 24 Hour Average (µg/m³)

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 10.7 8.3 8.0 9.2x 6.6x 5.5 6.3

Manteca 8.8 8.3 8.9 8.5x 6.3x 5.6 6.9

Tracy-Airport 6.9 5.8 4.3 5.7x 5.7x 4.9 4.3

Stanislaus

Modesto-14th 7.5 5.9 5.8 6.3x 5.1x 4.2

Turlock 9.5 8.2 9.6x 9.7x 8.9x 5.8 7.9

Merced

Merced-M St. 9.5 9.0 10.3x 9.9x 9.7x 7.5x 8.4

Merced-Vierra 11.0 9.4 11.9x 10.6x 10.2x 8.8x 9.2

Madera

Madera-City 10.1 8.1 9.8x 10.3x 11.2x 9.1x 8.9x

Madera

Fresno

Fresno-SSP

Clovis 13.3 10.9 11.3x 11.8x 12.1x 10.6x 12.5x

Fresno-Garland 14.3 11.3 11.4x 15.1x 15.3x 12.2x 11.2x

Fresno-Foundry 14.0 9.9 11.7x 13.0x 12.0x 8.2x 9.8x

Fresno-Pacific 12.0 8.0 8.9x 13.0x 12.4x 8.3x 9.0x

Fresno-Drummond

Parlier

Tranquillity 7.0 5.2 6.8x 3.6x 4.8x 3.4 2.6

Huron 9.6 7.2 6.8x 8.6x 7.0x 6.5 6.9

Kings

Hanford 14.1x 13.2 11.7x 12.4x 11.6x 10.2x 8.7

Corcoran 18.3x 11.4 9.2x 10.7x 10.0x 9.0x 10.0

Tulare

Visalia-Ashland 12.6x 9.8 10.5x 11.9x 12.7x

Porterville 10.5x 10.0 10.1x 9.5x 9.7x 7.6 8.1x

Ash Mountain-SNP 8.7x 8.4 7.0 7.7 7.6 6.8 5.2

Kern

Shafter

Oildale

Bakersfield-Gold 11.0 9.6 8.7 12.0x 8.6x 8.2 10.4x

Bakersfield-Calif 11.4 10.0 9.3 10.0x 10.5x 7.3 7.6x

Bakersfield-Muni

Edison

Arvin-DiGiorgio

Maricopa

Lebec 7.6 8.1 8.7 5.9 5.6 7.4 4.9

District Maximum 18.3 13.2 11.9 15.1 15.3 12.2 12.5
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