Ozone Eight-Hour Maximum (PPB)

The information in this report is based on preliminary data and is subject to change. The real-time PM10/PM2.5

monitoring equipment is used for air quality forecasting and trend analysis.

02/19 02/20 02/21 02/22 02/23 02/24 02/25

San Joaquin

Stockton-Hazelton 32
31
33
34
34
33
40

Manteca

Tracy-Airport 34
45
43
42
41
40
45

Stanislaus

Modesto-14th 36
33
36
40
37
37
45

Turlock 35
35
39
40
38
38
43

Merced

Merced-Coffee 37
36
35
40
31
38
41

Madera

Madera-City 40
38
41
41
41
42
41

Madera 41
38
43
42
41
43
41

Fresno

Fresno-SSP 39
36
41
41
40
40
40

Clovis 40
36
43
41
41
39
39

Fresno-Garland 38
32
42
37
40
38
38

Fresno-Drummond 41
34
41
42
40
34
37

Parlier 39
36
42
43
41
40
38

Tranquillity 33
37
39
38
40
42
42

Huron

Kings

Hanford 40
34
42
44
35
35
34

Corcoran

Tulare

Visalia, Church 35
27
34
38
38
36
32

Porterville 39
34
38
20
39
40
37

Ash Mountain-SNP 28
39
35
41
35
39
37

Lower Kaweah-SNP 30
38
45
44
41
46
44

Kern

Shafter 42
37
41
45
44
45
35

Oildale 41
34
38
43
41
42
35

Bakersfield-Calif 38
31
34
41
40
41
33

Bakersfield-Muni 39
30
35
39
39
39
32

Edison 38
30
39
42
42
44
38

Arvin-DiGiorgio 37
31
38
42
39
44
41

Maricopa 19
22
20
20
23
22
19

Lebec

District Maximum 42
45
45
45
44
46
45

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum

PM10 Federal 24-hr 0
Federal 1-Hr Ozone 0

O3-1hr (ppb) 56
PM10 State 24-hr 2
State 1-Hr Ozone 0

O3-8hr (ppb) 53
PM2.5 Federal 2006 24-hr 5
Federal 2008 8-Hr Ozone 0

PM 10 (µg/m³) 58
PM2.5 Federal 1997 24-hr 0
Federal 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 50
State 1997 8-Hr Ozone 0
¹Some of the days over the standards shown above may be the result of “Natural Events” such as extreme wind
episodes, or “Exceptional Events” such as wildfires and would not count as violations of the federal standard.
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Sunday, February 26, 2017 Page 1 of 1