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.

05/14 05/15 05/16 05/17 05/18 05/19 05/20

San Joaquin

Stockton-Hazelton 46
47
49
43
52
59
59

Manteca

Tracy-Airport 63
55

Stanislaus

Modesto-14th 50
52
54
47
56
65
68

Turlock 59
62
70
58
66
74
78

Merced

Merced-Coffee 58
67
62
63
68
70

Madera

Madera 50
57
66
58
58
67
64

Madera-City 57
62
72
67
63
70
70

Fresno

Clovis 60
62
72
69
61
73
81

Fresno-Drummond 58
64
74
68
63
75
80

Fresno-Garland 59
64
73
58
62
72
81

Fresno-SSP 56
62
71
65
62
71
72

Huron

Parlier 62
68
82
70
65
78
82

Tranquillity 49
57
68
58
63
68
67

Kings

Corcoran

Hanford 52
56
64
62
57
66
71

Tulare

Ash Mountain-SNP 62
64
72
80
64
76
78

Lower Kaweah-SNP 61
57
62
73
58
66
62

Porterville 60
62
75
71
62
73
76

Visalia, Church 58
63
75
68
61
72
78

Kern

Arvin-DiGiorgio 61
58
72
70
56
74
78

Bakersfield-Calif 61
61
77
71
61
76
80

Edison 59
58
74
70
57
73
77

Lebec

Maricopa 75
59
72
74

Oildale 60
61
78
68
62
76
81

Shafter 56
58
73
65
59
75
75

District Maximum 62
68
82
80
66
78
82

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) 101
PM10 State 24-hr 51
State 1-Hr Ozone 4

O3-8hr (ppb) 89
PM2.5 Federal 2006 24-hr 26
Federal 2008 8-Hr Ozone 13

PM 10 (µg/m³) 131
PM2.5 Federal 1997 24-hr 3
Federal 1997 8-Hr Ozone 3

PM 2.5 (µg/m³) 86
State 1997 8-Hr Ozone 18
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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Monday, May 21, 2012 Page 1 of 1