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.

05/15 05/16 05/17 05/18 05/19 05/20 05/21

San Joaquin

Stockton-Hazelton 45
43
41
39
43
39
41

Manteca

Tracy-Airport 52
48
47
49
48
45
46

Stanislaus

Modesto-14th 54
56
48
49
56
50
48

Turlock 56
58
48
51
57
52
49

Merced

Merced-Coffee 59
56
51
56
62
58
49

Madera

Madera-City 58
60
51
57
56
57
48

Madera 55
58
48
49
57
59
52

Fresno

Fresno-SSP 55
60
51
48
56
58
48

Clovis 52
59
52
56
55
59
48

Fresno-Garland 51
58
51
54
55
50
45

Fresno-Drummond 56
61
55
58
58
60
49

Parlier 54
62
57
59
61
63
48

Tranquillity 57
63
47
55
53
55
50

Huron

Kings

Hanford 57
62
54
53
55
58
46

Corcoran

Tulare

Visalia, Church 51
59
56
53
57
61
41

Porterville 43
52
44
46
49
52
33

Ash Mountain-SNP 37
58
55
48
60
55
35

Lower Kaweah-SNP 38
43
47
41
54
51
31

Kern

Shafter 51
57
47
51
53
55
43

Oildale 47
54
47
49
52
53
41

Bakersfield-Calif 51
61
51
54
57
58
45

Bakersfield-Muni 49
63
54
55
60
60
46

Edison 44
58
52
53
55
57
41

Arvin-DiGiorgio 47
63
54
57
60
61
44

Maricopa 50
62
55
52
55
46
47

Lebec

District Maximum 59
63
57
59
62
63
52

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) 107
PM10 State 24-hr 20
State 1-Hr Ozone 1

O3-8hr (ppb) 91
PM2.5 Federal 2006 24-hr 30
Federal 2008 8-Hr Ozone 7

PM 10 (µg/m³) 125
PM2.5 Federal 1997 24-hr 5
Federal 1997 8-Hr Ozone 1

PM 2.5 (µg/m³) 99
State 1997 8-Hr Ozone 14
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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Friday, May 22, 2015 Page 1 of 1