PM25 24 Hour Average (µg/m3)

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 6
9
10
11
11
12
9

Manteca 6
7
9
11
10
12
8

Tracy-Airport 8
6
10
11

Stanislaus

Modesto-14th 9
9
11
12
12
14
11

Turlock 12
11
13
11
14
16
13

Merced

Merced-Coffee 9
11
10
14
13
11

Madera

Madera

Madera-City 15
16
21
21
21
20
18

Fresno

Clovis 11
10
16
17
18
17
19

Fresno-Drummond

Fresno-Garland 9
9
12
11
13
13
14

Fresno-SSP

Huron 9
13
13
10
13
16
14

Parlier

Tranquillity 6
7
9
4
10
10
8

Kings

Corcoran

Hanford 11
11
14
10
12
15
15

Tulare

Ash Mountain-SNP 11
12
12
8
11
13
11

Lower Kaweah-SNP

Porterville 14
13
16
18
16
18
17

Visalia, Church 11
11
15
17
14
18
19

Kern

Arvin-DiGiorgio

Bakersfield-Calif 10
11
15
16
12
17
18

Edison

Lebec 10
10
11
11
9
16
16

Maricopa

Oildale

Shafter

District Maximum 15
16
21
21
21
20
19

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