AQI by Site

AQI is based on measured data at each site. Some sites measure only ozone or only PM-2.5. In summer only those sites with ozone

measurements estimate the AQI correctly, and in winter only those sites with PM-2.5 measurements estimate the AQI correctly. The

information in this report is based on preliminary data and is subject to change. The real-time PM-10/PM-2.5 monitoring eqiupment is

used for air quality forecasting and trend analysis.

01/27
01/28
01/29
01/30
01/31
02/01
02/02

San Joaquin

Stockton-Hazelton 23 (PM25) 42 (PM25) 62 (PM25) 72 (PM25) 42 (PM25) 32 (PM25) 23 (PM25)

Manteca 16 (PM25) 42 (PM25) 58 (PM25) 66 (PM25) 39 (PM25) 29 (PM25) 26 (PM25)

Tracy-Airport 31 (O3-8) 25 (O3-8) 39 (PM25) 29 (PM25) 32 (PM25) 29 (O3-8) 30 (O3-8)

Stanislaus

Modesto-14th 26 (PM25) 58 (PM25) 82 (PM25) 95 (PM25) 62 (PM25) 42 (PM25) 36 (PM25)

Turlock 39 (PM25) 68 (PM25) 95 (PM25) 91 (PM25) 74 (PM25) 56 (PM25) 45 (PM25)

Merced

Merced-Coffee 39 (PM25) 60 (PM25) 64 (PM25) 62 (PM25) 68 (PM25) 52 (PM25) 49 (PM25)

Madera

Madera 8 (O3-8) 25 (O3-8) 21 (O3-8) 23 (O3-8) 12 (O3-8)

Madera-City 52 (PM25) 62 (PM25) 72 (PM25) 82 (PM25) 89 (PM25) 64 (PM25) 58 (PM25)

Fresno

Clovis 60 (PM25) 76 (PM25) 83 (PM25) 99 (PM25) 102 (PM25) 62 (PM25) 66 (PM25)

Fresno-Drummond 7 (CO) 27 (O3-8) 10 (CO) 6 (CO) 5 (CO) 5 (CO) 8 (CO)

Fresno-First 6 (O3-8) 22 (O3-8) 20 (O3-8) 13 (O3-8) 7 (O3-8)

Fresno-SSP 8 (O3-8) 26 (O3-8) 25 (O3-8) 8 (CO) 7 (CO) 19 (O3-8) 4 (CO)

Huron 42 (PM25) 49 (PM25) 66 (PM25) 76 (PM25) 76 (PM25) 62 (PM25) 39 (PM25)

Parlier 8 (O3-8) 28 (O3-8) 28 (O3-8) 22 (O3-8) 25 (O3-8) 30 (O3-8) 21 (O3-8)

Tranquillity 26 (PM25) 36 (PM25) 60 (PM25) 82 (PM25) 76 (PM25) 56 (PM25) 26 (PM25)

Kings

Corcoran

Hanford 62 (PM25) 70 (PM25) 82 (PM25) 102 (PM25) 108 (PM25) 74 (PM25) 49 (PM25)

Tulare

Ash Mountain-SNP 68 (PM25) 27 (O3-8) 31 (O3-8) 31 (O3-8) 60 (PM25) 64 (PM25) 29 (PM25)

Lower Kaweah-SNP 26 (O3-8) 35 (O3-8) 36 (O3-8) 35 (O3-8) 30 (O3-8) 31 (O3-8) 33 (O3-8)

Porterville 97 (PM25) 74 (PM25) 78 (PM25) 97 (PM25) 139 (PM25) 122 (PM25) 49 (PM25)

Visalia, Church 70 (PM25) 68 (PM25) 70 (PM25) 82 (PM25) 112 (PM25) 80 (PM25) 29 (PM25)

Kern

Arvin-DiGiorgio 7 (O3-8) 16 (O3-8) 26 (O3-8) 27 (O3-8) 34 (O3-8) 31 (O3-8) 25 (O3-8)

Bakersfield-Calif 87 (PM25) 74 (PM25) 85 (PM25) 102 (PM25) 118 (PM25) 122 (PM25) 54 (PM25)

Edison 14 (O3-8) 21 (O3-8) 27 (O3-8) 26 (O3-8) 37 (O3-8) 37 (O3-8) 31 (O3-8)

Lebec 32 (PM25) 13 (PM25) 16 (PM25) 54 (PM25) 78 (PM25) 78 (PM25) 39 (PM25)

Maricopa 13 (O3-8) 21 (O3-8) 30 (O3-8) 36 (O3-8) 36 (O3-8) 34 (O3-8) 33 (O3-8)

Oildale 17 (O3-8) 19 (O3-8) 25 (O3-8) 26 (O3-8) 33 (O3-8) 34 (O3-8) 29 (O3-8)

Shafter 8 (O3-8) 15 (O3-8) 22 (O3-8) 23 (O3-8) 29 (O3-8) 24 (O3-8) 27 (O3-8)

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) 60
PM10 State 24-hr 24
State 1-Hr Ozone 0

O3-8hr (ppb) 54
PM2.5 Federal 2006 24-hr 24
Federal 2008 8-Hr Ozone 0

PM 10 (µg/m³) 131
PM2.5 Federal 1997 24-hr 3
Federal 1997 8-Hr Ozone 0

PM 2.5 (µg/m³) 86
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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Friday, February 03, 2012 Page 1 of 1