Daily Report

PM2.5 24 Hour Average (µg/m³)

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

09/15

09/16

09/17

09/18

09/19

09/20

09/21

San Joaquin

Stockton-University

10.0

10.7

8.3

8.0

9.2x

6.6x

5.5

Manteca

10.4

8.8

8.3

8.9

8.5x

6.3x

5.6

Tracy-Airport

7.3

6.9

5.8

4.3

5.7x

4.9

Stanislaus

Modesto-14th

7.6

7.5

5.9

5.8

6.3x

5.1x

4.2

Turlock

9.0

9.5

8.2

9.6x

9.7x

8.9x

5.8

Merced

Merced-M St.

8.4

9.5

9.0

10.3x

9.9x

9.7x

7.5x

Merced-Vierra

10.2

11.0

9.4

11.9x

10.6x

10.2x

8.8x

Madera

Madera-City

11.9

10.1

8.1

9.8x

10.3x

11.2x

9.1x

Madera

Fresno

Fresno-SSP

Clovis

13.1

13.3

10.9

11.3x

11.8x

12.1x

10.6x

Fresno-Garland

17.6

14.3

11.3

11.4x

15.1x

15.3x

12.2x

Fresno-Foundry

16.0

14.0

9.9

11.7x

13.0x

12.0x

8.2x

Fresno-Pacific

14.6

12.0

8.0

8.9x

13.0x

12.4x

8.3x

Fresno-Drummond

Parlier

Tranquillity

5.6

7.0

5.2

6.8x

3.6x

4.8x

3.4

Huron

7.0

9.6

7.2

6.8x

8.6x

7.0x

6.5

Kings

Hanford

15.3

14.1x

13.2

11.7x

12.4x

11.6x

10.2x

Corcoran

14.4

18.3x

11.4

9.2x

10.7x

10.0x

9.0x

Tulare

Visalia-Ashland

12.1

12.6x

9.8

10.5x

11.9x

12.7x

Porterville

9.7

10.5x

10.0

10.1x

9.5x

9.7x

7.6

Ash Mountain-SNP

7.1

8.7x

8.4

7.0

7.7

7.6

6.8

Kern

Shafter

Oildale

Bakersfield-Gold

10.1

11.0

9.6

8.7

12.0x

8.6x

8.2

Bakersfield-Calif

9.9

11.4

10.0

9.3

10.0x

10.5x

7.3

Bakersfield-Muni

Edison

Arvin-DiGiorgio

Maricopa

Lebec

3.8

7.6

8.1

8.7

5.9

5.6

7.4

District Maximum

17.6

18.3

13.2

11.9

15.1

15.3

12.2

Maximum Measured

Value for This Year

Pollutant	Maximum
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.

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Tuesday, September 22, 2026

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