AQI by Site

AQI is based on measured data at each site. Some sites measure only ozone or only PM2.5. In

summer only those sites with ozone measurements estimate the AQI correctly. In winter only

those sites with PM2.5 measurements estimate the AQI correctly.

The information in this report is based on preliminary data and is subject to change. The real-time

PM10 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 21 (O3-8) 13 (O3-8) 11 (O3-8) 15 (O3-8) 14 (O3-8) 16 (O3-8) 19 (O3-8)

Modesto-14th 83 (PM25) 62 (PM25)
60 (PM25) 66 (PM25) 74 (PM25) 49 (PM25)

Stockton-Hazelton 66 (PM25) 58 (PM25) 58 (PM25) 64 (PM25) 74 (PM25) 29 (PM25) 52 (PM25)

Tracy-Airport 29 (PM25) 39 (PM25) 26 (PM25) 39 (PM25) 39 (PM25) 29 (O3-8) 24 (O3-8)

Turlock 80 (PM25) 68 (PM25) 60 (PM25) 62 (PM25) 85 (PM25) 45 (PM25) 56 (PM25)

Central

Clovis 83 (PM25) 89 (PM25) 82 (PM25) 87 (PM25) 72 (PM25) 62 (PM25) 66 (PM25)

Corcoran 80 (PM25) 95 (PM25) 82 (PM25) 83 (PM25) 76 (PM25) 54 (PM25) 39 (PM25)

Fresno-Drummond 14 (O3-8) 13 (O3-8) 9 (O3-8) 13 (O3-8) 14 (O3-8) 8 (O3-8) 15 (CO)

Fresno-First 95 (PM25) 91 (PM25) 85 (PM25) 89 (PM25) 82 (PM25) 66 (PM25) 87 (PM25)

Fresno-SSP 22 (O3-8) 14 (O3-8) 10 (O3-8) 14 (O3-8) 12 (O3-8) 12 (O3-8) 10 (O3-8)

Hanford

Madera 26 (O3-8) 18 (O3-8) 14 (O3-8) 14 (O3-8) 15 (O3-8) 14 (O3-8) 14 (O3-8)

Parlier 17 (O3-8) 15 (O3-8) 9 (O3-8) 14 (O3-8) 14 (O3-8) 8 (O3-8) 14 (O3-8)

Southern

Arvin 29 (O3-8) 30 (O3-8) 19 (O3-8) 19 (O3-8) 14 (O3-8) 16 (O3-8) 19 (O3-8)

Ash Mountain-SNP 39 (PM25) 39 (PM25) 70 (PM25) 42 (PM25) 26 (PM25) 36 (PM25) 29 (PM25)

Bakersfield-Calif 104 (PM25) 124 (PM25) 135 (PM25) 135 (PM25) 89 (PM25) 70 (PM25) 70 (PM25)

Bakersfield-Gold 95 (PM25) 102 (PM25) 124 (PM25) 126 (PM25) 112 (PM25) 54 (PM25) 64 (PM25)

Edison 23 (O3-8) 21 (O3-8) 17 (O3-8) 17 (O3-8) 12 (O3-8) 10 (O3-8) 14 (O3-8)

Lower Kaweah-SNP 27 (O3-8) 34 (O3-8) 36 (O3-8) 36 (O3-8) 32 (O3-8) 31 (O3-8) 36 (O3-8)

Maricopa 25 (O3-8) 20 (O3-8) 17 (O3-8) 14 (O3-8) 10 (O3-8) 19 (O3-8) 20 (O3-8)

Oildale 25 (O3-8) 17 (O3-8) 17 (O3-8) 15 (O3-8) 9 (O3-8) 10 (O3-8) 12 (O3-8)

Shafter 22 (O3-8) 20 (O3-8) 14 (O3-8) 14 (O3-8) 13 (O3-8) 14 (O3-8) 14 (O3-8)

Visalia, Church 78 (PM25) 83 (PM25) 83 (PM25) 74 (PM25) 70 (PM25) 56 (PM25) 56 (PM25)

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