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.

05/16 05/17 05/18 05/19 05/20 05/21 05/22

San Joaquin

Stockton-Hazelton 41
42
46
53
53
47
43

Manteca

Tracy-Airport 49
47
52
57
62
53
47

Stanislaus

Modesto-14th 47
47
54
60
62
55
47

Turlock 47
52
58
62
66
57
49

Merced

Merced-Coffee 50
54
69
57
51

Madera

Madera 46
52
57
57
65
52
51

Madera-City 51
57
63
63
70
58
56

Fresno

Clovis 44
53
62
59
71
58
53

Fresno-Drummond 41
66
58
51

Fresno-Garland 45
52
60
58
68
57
53

Fresno-SSP 46
55
61
60
68
59
55

Huron

Parlier 39
52
64
58
68
54

Tranquillity 48
52
56
58
65
53
52

Kings

Corcoran

Hanford 45
53
63
63
69
59
55

Tulare

Ash Mountain-SNP 53
51
60
62
71
79
55

Lower Kaweah-SNP 54
45
56
61
67
78
53

Porterville 44
52
59
62
70
73
52

Visalia, Church 35
42
51
49
56
55
43

Kern

Arvin-DiGiorgio 50
50
58
56
70
74
52

Bakersfield-Calif 51
52
63
62
72
77
55

Bakersfield-Muni 50
51
61
61
72
74
53

Edison 41
42
50
48
59
62
45

Lebec

Maricopa 51
49
57
57
70
78
52

Oildale 46
47
56
56
61
65
47

Shafter 46
48
56
58
63
70
52

District Maximum 54
57
64
63
72
79
56

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) 103
PM10 State 24-hr 42
State 1-Hr Ozone 6

O3-8hr (ppb) 86
PM2.5 Federal 2006 24-hr 27
Federal 2008 8-Hr Ozone 13

PM 10 (µg/m³) 140
PM2.5 Federal 1997 24-hr 2
Federal 1997 8-Hr Ozone 1

PM 2.5 (µg/m³) 68
State 1997 8-Hr Ozone 19
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, May 23, 2013 Page 1 of 1