California Air Resources Board

Highest Annual Geometric Mean
PM10 Concentration in Each Air Basin
1988-1996

 Basin Name Highest Annual Geometric Mean PM10 Concentration in ug/m3
1988 1989 1990 1991 1992 1993 1994 1995 1996
 Great Basin Valleys 37.9 24.1 29 26.9 28.9 27.6 30.3 28.1 23.3
 Lake County 11.9 12 10.1 11 11.1 9.9 10.1 9.6 9.1
 Lake Tahoe 30 24.9 26 24.5 24.9 23.8 23.5 20.2 19.3
 Mojave Desert 47.5 43 53.5 41 35.6 33.3 36.4 22.6 26.8
 Mountain Counties 102.1 65.5 35.6 34.1 31 42 28.7 26.7 23.3
 North Central Coast 27.9 29.1 26.7 22.8 21.9 31.3 27.6 29.5 27.7
 North Coast 31.7 28.2 24.4 22.5 20.1 20.5 27.6 23.4 21.6
 Northeast Plateau 21.9 21.7 20.2 21.6 20.9 22.3 25.9 25.4 20.6
 Sacramento Valley 36.7 55.4 69.6 45.7 37.6 31.9 31.1 33.9 25.5
 Salton Sea 52.2 66.4 64.9 59.8 43.7 47.2 106.8 59.6 90.3
 San Diego 36.8 41.3 33.4 38 33.5 39.9 45.2 39.8 38.9
 San Francisco Bay Area 34.6 35.6 32.9 31.5 29.5 28.1 26.6 25.6 22.1
 San Joaquin Valley 65.4 88.6 133.7 69.4 55.6 69.8 51.2 48.9 47.6
 South Central Coast 35.7 40.8 34.5 37.4 37.2 36.8 30.6 36.8 31
 South Coast 81.8 81.3 66.9 65.5 62.4 58 55.9 51.8 52

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This page last revised on October 9, 1997
 
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