ARB Logo California Map with Basin Highlighted
Basin by Basin Comparison of 1996 Ozone Data
Basin Name Days Standard Exceeded Ozone Concentrations in ppm
1 hour 8 hour
State
1hr
Federal
1hr
Federal
8hr
Max
1hr
3 Year
4th High*
EPDC*
Max
8hr
3 Year Avg
4th High*
Great Basin Valleys 1 0 1 0.10 0.10 0.099 0.090 0.079
Lake County 0 0 0 0.09 0.08 0.082 0.070 0.060
Lake Tahoe 0 0 0 0.08 0.08 0.084 0.073 0.071
Mojave Desert 108 39 91 0.18 0.18 0.186 0.146 0.131
Mountain Counties 65 7 59 0.14 0.13   0.113 0.103
North Central Coast 16 0 9 0.12 0.11 0.111 0.101 0.085
North Coast 0 0 0 0.08 0.09 0.088 0.071 0.069
Northeast Plateau 0 0 0 0.07 0.07   0.063 0.059
Sacramento Valley 58 9 44 0.16 0.15 0.154 0.126 0.106
Salton Sea 97 21 62 0.18 0.18   0.125 0.111
San Diego 51 2 31 0.14 0.14 0.142 0.117 0.104
San Francisco B. A. 34 8 14 0.14 0.14 0.151 0.112 0.093
San Joaquin Valley 120 56 114 0.17 0.17 0.164 0.137 0.119
South Central Coast 82 19 68 0.16 0.16 0.161 0.127 0.119
South Coast 141 85 115 0.24 0.23   0.173 0.161
* The 3 year 4th high, 3 year average 4th high, and Expected Peak Day Concentration (EPDC) are calculated based on data for 3 successive years, listed by the last year of the three year period.  The EPDC represents the ozone concentration expected to occur once per year.
   

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This page last revised on March 26, 1999

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