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.

03/21 03/22 03/23 03/24 03/25 03/26 03/27

San Joaquin

Stockton-Hazelton 38
38
38
21
37
41
35

Manteca

Tracy-Airport 43
46
44
33
42
44
40

Stanislaus

Modesto-14th 37
41
42
29
43
44
42

Turlock 36
40
40
32
43
42
41

Merced

Merced-Coffee 36
40
42
35
42
43
41

Madera

Madera-City 33
39
44
37
45
45
43

Madera 34
38
43
33
44
42
42

Fresno

Fresno-SSP 34
36
44
44
42

Clovis 38
44
42
41

Fresno-Garland 35
39
44
35
43
44
42

Fresno-Drummond 35
38
44
38
44
44
42

Parlier 32
48
45
40
49
44
43

Tranquillity 33
38
44
31
43
43
42

Huron

Kings

Hanford 31
41
43
37
47
47
45

Corcoran

Tulare

Visalia, Church 28
45
44
41
47
48
43

Porterville 26
44
41
41
45
45
41

Ash Mountain-SNP 21
42
36
34
42
36
35

Lower Kaweah-SNP 32
46
36
45
44
35
41

Kern

Shafter 33
41
44
50
42
48
45

Oildale 35
45
44
48
46
46
46

Bakersfield-Calif 33
42
45
48
46
45
44

Bakersfield-Muni 33
44
43
48
46
44
43

Edison 30
44
44
50
49
46
45

Arvin-DiGiorgio 28
44
43
50
49
46
43

Maricopa 33
41
44
50
40
45
44

Lebec

District Maximum 43
48
45
50
49
48
46

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) 83
PM10 State 24-hr 8
State 1-Hr Ozone 0

O3-8hr (ppb) 70
PM2.5 Federal 2006 24-hr 7
Federal 2008 8-Hr Ozone 0

PM 10 (µg/m³) 70
PM2.5 Federal 1997 24-hr 0
Federal 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 50
State 1997 8-Hr Ozone 0
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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Tuesday, March 28, 2017 Page 1 of 1