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.

04/19
04/20
04/21
04/22
04/23
04/24
04/25

San Joaquin

Stockton-Hazelton 36 (O3-8) 42 (PM25) 53 (PM25) 55 (PM25) 57 (PM25) 64 (PM25) 53 (PM25)

Manteca 21 (PM25) 25 (PM25) 33 (PM25) 42 (PM25) 46 (PM25) 55 (PM25) 46 (PM25)

Tracy-Airport 41 (O3-8) 44 (O3-8) 44 (O3-8) 46 (O3-8) 54 (O3-8) 53 (PM25)

Stanislaus

Modesto-14th 43 (O3-8) 40 (O3-8) 50 (O3-8) 54 (O3-8) 71 (O3-8) 74 (O3-8) 58 (O3-8)

Turlock 25 (PM25) 42 (O3-8) 51 (O3-8) 50 (PM25) 53 (PM25) 80 (O3-8) 61 (O3-8)

Merced

Merced-Coffee 39 (O3-8) 38 (PM25) 43 (O3-8) 42 (O3-8) 47 (O3-8) 53 (PM25) 50 (PM25)

Madera

Madera-City 44 (O3-8) 44 (O3-8) 48 (O3-8) 54 (O3-8) 74 (O3-8) 90 (O3-8) 67 (O3-8)

Madera 43 (O3-8) 44 (O3-8) 48 (O3-8) 51 (O3-8) 77 (O3-8) 90 (O3-8) 64 (O3-8)

Fresno

Fresno-SSP 46 (O3-8) 51 (O3-8) 58 (O3-8) 77 (O3-8) 90 (O3-8) 100 (O3-8) 90 (O3-8)

Clovis 43 (O3-8) 45 (O3-8) 48 (O3-8) 61 (O3-8) 67 (O3-8) 80 (O3-8) 97 (O3-8)

Fresno-Garland 44 (O3-8) 45 (O3-8) 54 (O3-8) 74 (O3-8) 84 (O3-8) 97 (O3-8) 87 (O3-8)

Fresno-Drummond 44 (O3-8) 50 (O3-8) 64 (O3-8) 71 (O3-8) 90 (O3-8) 105 (O3-8) 87 (O3-8)

Parlier 44 (O3-8) 51 (O3-8) 67 (O3-8) 80 (O3-8) 93 (O3-8) 100 (O3-8) 105 (O3-8)

Tranquillity 44 (O3-8) 44 (O3-8) 50 (O3-8) 61 (O3-8) 80 (O3-8) 87 (O3-8) 87 (O3-8)

Huron 13 (PM25) 21 (PM25) 25 (PM25) 29 (PM25) 33 (PM25) 42 (PM25) 46 (PM25)

Kings

Hanford 44 (O3-8) 48 (O3-8) 67 (O3-8) 64 (O3-8) 80 (O3-8) 93 (O3-8) 90 (O3-8)

Corcoran 21 (PM25) 38 (PM25) 53 (PM25) 50 (PM25) 50 (PM25) 46 (PM25) 50 (PM25)

Tulare

Visalia, Church 44 (O3-8) 54 (O3-8) 67 (O3-8) 71 (O3-8) 77 (O3-8) 87 (O3-8) 90 (O3-8)

Porterville 44 (O3-8) 47 (O3-8) 58 (O3-8) 58 (O3-8) 59 (PM25) 77 (O3-8) 87 (O3-8)

Ash Mountain-SNP 46 (PM25) 50 (PM25) 47 (O3-8) 64 (O3-8) 74 (O3-8) 77 (O3-8) 87 (O3-8)

Lower Kaweah-SNP 43 (O3-8) 40 (O3-8) 49 (O3-8) 51 (O3-8) 61 (O3-8) 64 (O3-8) 87 (O3-8)

Kern

Shafter 45 (O3-8) 46 (O3-8) 71 (O3-8) 64 (O3-8) 61 (O3-8) 87 (O3-8) 84 (O3-8)

Oildale 48 (O3-8) 51 (O3-8) 77 (O3-8) 87 (O3-8) 77 (O3-8) 97 (O3-8) 108 (O3-8)

Bakersfield-Calif 47 (O3-8) 54 (O3-8) 84 (O3-8) 84 (O3-8) 77 (O3-8) 97 (O3-8) 112 (O3-8)

Bakersfield-Muni 46 (O3-8) 54 (O3-8) 84 (O3-8) 84 (O3-8) 80 (O3-8) 97 (O3-8) 112 (O3-8)

Edison 45 (O3-8) 58 (O3-8) 77 (O3-8) 90 (O3-8) 80 (O3-8) 97 (O3-8) 108 (O3-8)

Arvin-DiGiorgio 45 (O3-8) 58 (O3-8) 71 (O3-8) 84 (O3-8) 77 (O3-8) 101 (O3-8) 122 (O3-8)

Maricopa 47 (O3-8) 48 (O3-8) 80 (O3-8) 84 (O3-8) 77 (O3-8) 97 (O3-8) 108 (O3-8)

Lebec 21 (PM25) 25 (PM25) 33 (PM25) 38 (PM25) 33 (PM25) 38 (PM25) 42 (PM25)

Maximum Measured Unofficial Days Over the Federal and State Standards¹

Value for This Year

Pollutant Maximu

PM10 Federal 24-hr 2
Federal 1-Hr 0

O3-1hr (ppb) 89

PM10 State 24-hr 31
State 1-Hr Ozone 0

O3-8hr (ppb) 77

PM2.5 Federal 2006 24-hr 16
Federal 2008 8-Hr 1

PM 10 178
PM2.5 Federal 1997 24-hr

PM2.5 Federal 1997 24-hr 4
Federal 1997 8-Hr 0

PM 2.5 103

State 1997 8-Hr Ozone 3
¹Data affected by smoke, high winds, fireworks, and etc. and which exceeded a federal standard are
denoted with an ‘x’ in the table above. Values marked with an ‘x’ are not included in the tallies above.
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