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.

12/29 12/30 12/31 01/01 01/02 01/03 01/04

Northern

Merced-Coffee 25
15
13
18
16
19
22

Modesto-14th 10
7
10
16
11
21

Stockton-Hazelton 13
4
4
13
9
23
14

Tracy-Airport 24
20
12
18
19
34
28

Turlock 15
10
12
20
14
21
22

Regional Maximum 25
20
13
20
19
34
28

Central

Clovis 20
19
14
16
16
12
9

Corcoran 29
24
18
22
19
25
21

Fresno-Drummond 16
15
11
15
16
10
8

Fresno-First 26
19
10
19
15
14
10

Fresno-SSP 26
17
12
17
14
14
12

Hanford

Madera 31
21
16
17
18
16
17

Parlier 20
18
11
16
16
10
16

Regional Maximum 31
24
18
22
19
25
21

Southern

Arvin 34
35
22
23
17
19
23

Ash Mountain-SNP 28
25
24
15
18
12
19

Bakersfield-Calif 21
16
9
12
10
10
15

Bakersfield-Gold 17
10
13
12
9
8
12

Edison 27
25
20
20
14
12
16

Lower Kaweah-SNP 32
40
42
43
38
37
42

Maricopa 30
24
20
16
12
23
24

Oildale 30
20
20
18
11
12
14

Shafter 26
24
16
16
15
17
16

Visalia, Church 24
23
20
23
20
15
15

Regional Maximum 34
40
42
43
38
37
42

Maximum Measured Unofficial Days Over¹ the Federal and State Standards

Value for This Year

Pollutant Maximum PM10 Federal 24-hr 0
Federal 1-Hr Ozone 0

PM10 State 24-hr 2
State 1-Hr Ozone 0

O3-1hr (ppb) 43

O3-8hr (ppb) 43

Federal 2008 8-Hr Ozone 0

PM 10 (µg/m³) 67
PM2.5 Federal 2006 24-hr 2

PM 2.5 (µg/m³) 58
Federal 1997 8-Hr Ozone 0

PM2.5 Federal 1997 24-hr 0

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.
Monday, January 05, 2009 Page 1 of 1