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.

04/17 04/18 04/19 04/20 04/21 04/22 04/23

San Joaquin

Stockton-Hazelton 49
44
51
49
54
48
45

Manteca

Tracy-Airport 57
56
55
57
63
55
53

Stanislaus

Modesto-14th 57
52
58
55
63
55
51

Turlock 65
58
65
61
67
62
57

Merced

Merced-Coffee 59
55
65
57
65
56
51

Madera

Madera 57
72
58
64
58
52

Madera-City 61
57
69
58
64
57
50

Fresno

Clovis 66
62
71
60
65
57
52

Fresno-Drummond 60
58
66
57
61
55
50

Fresno-Garland 58
54
66
55
60
47
50

Fresno-SSP 62
59
73
59
64
57
52

Huron

Parlier 65
65
69
64
68
57
55

Tranquillity 65
55
69
59
65
60
53

Kings

Corcoran

Hanford 62
55
63
56
65
57
52

Tulare

Ash Mountain-SNP 68
61
65
61
69
45
56

Lower Kaweah-SNP 63
57
58
57
64
51
48

Porterville 57
51
56
50
64
53
52

Visalia, Church 54
52
58
52
61
50
48

Kern

Arvin-DiGiorgio 68
59
60
61
74
54
55

Bakersfield-Calif 63
53
54
54
71
54
51

Bakersfield-Muni 67
55
55
56
73
55
52

Edison

Lebec

Maricopa 70
58
59
58
71
55
54

Oildale 55
47
48
47
65
49
46

Shafter 63
53
55
52
68
55
53

District Maximum 70
65
73
64
74
62
57

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximum

PM10 Federal 24-hr 3
Federal 1-Hr Ozone 0

O3-1hr (ppb) 92
PM10 State 24-hr 49
State 1-Hr Ozone 0

O3-8hr (ppb) 80
PM2.5 Federal 2006 24-hr 28
Federal 2008 8-Hr Ozone 3

PM 10 (µg/m³) 176
PM2.5 Federal 1997 24-hr 12
Federal 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 98
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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Thursday, April 24, 2014 Page 1 of 1