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.

05/20 05/21 05/22 05/23 05/24 05/25 05/26

San Joaquin

Stockton-Hazelton 55
59
66
63
49
45
39

Manteca

Tracy-Airport 54
56
69
75
57
45
43

Stanislaus

Modesto-14th 60
61
74
80
58
52
44

Turlock 65
65
78
85
70
52
47

Merced

Merced-Coffee 64
63
65
73
67
43
43

Madera

Madera-City 70
67
69
78
71
52
45

Madera 72
69
77
77
69
52
45

Fresno

Fresno-SSP 73
71
72
82
73
55
47

Clovis 71
70
72
88
77
57
42

Fresno-Garland 71
69
73
86
76
55
43

Fresno-Drummond 74
72
76
77
57
46

Parlier 75
75
79
90
82
61
45

Tranquillity 63
62
67
74
68
46
42

Huron

Kings

Hanford 74
71
81
86
77
55
47

Corcoran

Tulare

Visalia, Church 75
78
83
92
82
54
45

Porterville 68
68
73
84
78
46
41

Ash Mountain-SNP 64
70
72
81
90
59
39

Lower Kaweah-SNP 60
68
66
77
88
60
49

Kern

Shafter 72
70
75
78
64
43
46

Oildale 73
68
81
82
45

Bakersfield-Calif 75
72
83
85
74
48
48

Bakersfield-Muni 70
66
79
82
76
45
45

Edison 69
66
76
83
75
48
45

Arvin-DiGiorgio 73
68
78
86
81
52
48

Maricopa 68
67
71
83
74
52
45

Lebec

District Maximum 75
78
83
92
90
61
49

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) 104
PM10 State 24-hr 26
State 1-Hr Ozone 4

O3-8hr (ppb) 92
PM2.5 Federal 2006 24-hr 7
Federal 2008 8-Hr Ozone 8

PM 10 (µg/m³) 92
PM2.5 Federal 1997 24-hr 0
Federal 1997 8-Hr Ozone 3

PM 2.5 (µg/m³) 50
State 1997 8-Hr Ozone 13
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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Saturday, May 27, 2017 Page 1 of 1