California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Alameda County
Year Number of 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*
1998 22 6 10 0.15 0.14 0.151 0.110 0.089
1997 6 0 0 0.11 0.14 0.149 0.084 0.090
1996 23 8 10 0.14 0.14 0.151 0.112 0.093
1995 21 9 12 0.16 0.14 0.135 0.115 0.087
1994 7 2 3 0.13 0.12 0.118 0.092 0.082
1993 8 2 4 0.13 0.12 0.126 0.102 0.081
1992 16 1 3 0.13 0.12 0.130 0.091 0.082
1991 19 1 2 0.14 0.13 0.129 0.092 0.084
1990 9 2 4 0.13 0.13 0.136 0.105 0.087
1989 14 2 5 0.14 0.14 0.138 0.101 0.089
1988 27 4 8 0.15 0.14 0.143 0.096 0.087
1987 21 7 11 0.16 0.14 0.141 0.116 0.089
1986 22 5 5 0.14 0.15 0.148 0.106 0.093
1985 27 7 12 0.15 0.16 0.157 0.106 0.096
1984 36 10 15 0.15 0.16 0.155 0.118 0.090
1983 29 13 12 0.19 0.16 0.148 0.127 0.086
1982 12 4 4 0.15 0.17 0.142 0.097 0.084
1981 26 5 7 0.16 0.17 0.147 0.110 0.090
1980 18 7 8 0.19 0.18 0.166 0.135 0.092
* 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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