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.

04/20 04/21 04/22 04/23 04/24 04/25 04/26

San Joaquin

Stockton-Hazelton 46
32
39
41
37
41
23

Manteca

Tracy-Airport 53
49
44
50
46
49
31

Stanislaus

Modesto-14th 54
49
45
49
43
47
28

Turlock 55
51
47
51
37

Merced

Merced-Coffee 53
47
46
50
45
53
32

Madera

Madera-City 54
53
53
54
47
57
36

Madera 51
55
54
54
48
56
37

Fresno

Fresno-SSP 55
56
56
54
47
54
38

Clovis 53
60
64
53
45
54
37

Fresno-Garland 54
57
56
54
46
55
38

Fresno-Drummond 54
58
60
55
43
56
39

Parlier 54
57
69
55
49
56
47

Tranquillity 51
51
53
50
44
52
33

Huron

Kings

Hanford 56
57
63
57
50
57
42

Corcoran

Tulare

Visalia, Church 57
59
70
55
51
56
53

Porterville 55
55
67
50
50
54
54

Ash Mountain-SNP 43
47
57
41
40
33
47

Lower Kaweah-SNP 39
44
51
46
36
46
37

Kern

Shafter 54
52
61
52
48
54
45

Oildale 57
61
53
58
50

Bakersfield-Calif 58
67
68
57
53
60
49

Bakersfield-Muni 54
62
67
53
50
55
47

Edison 54
63
50
51

Arvin-DiGiorgio 57
62
71
54
53
55
53

Maricopa 52
53
66
52
49
52
41

Lebec

District Maximum 58
67
71
57
53
60
54

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) 83
PM10 State 24-hr 11
State 1-Hr Ozone 0

O3-8hr (ppb) 73
PM2.5 Federal 2006 24-hr 7
Federal 2008 8-Hr Ozone 0

PM 10 (µg/m³) 76
PM2.5 Federal 1997 24-hr 0
Federal 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 50
State 1997 8-Hr Ozone 2
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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Thursday, April 27, 2017 Page 1 of 1