California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Santa Clara 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 3 8 0.15 0.12 0.127 0.111 0.085
1997 3 0 0 0.11 0.13 0.125 0.084 0.085
1996 24 1 8 0.13 0.13 0.126 0.103 0.088
1995 22 6 14 0.15 0.13 0.125 0.109 0.086
1994 8 1 2 0.13 0.12 0.115 0.095 0.080
1993 14 1 4 0.13 0.12 0.119 0.112 0.080
1992 15 1 3 0.13 0.12 0.117 0.101 0.078
1991 12 1 5 0.13 0.12 0.117 0.108 0.082
1990 10 1 4 0.13 0.12 0.130 0.096 0.088
1989 17 3 7 0.13 0.14 0.148 0.102 0.097
1988 34 2 19 0.14 0.14 0.147 0.101 0.092
1987 41 12 25 0.17 0.14 0.149 0.108 0.092
1986 32 1 10 0.14 0.15 0.155 0.105 0.097
1985 40 7 14 0.16 0.16 0.173 0.127 0.103
1984 50 19 28 0.17 0.16 0.164 0.124 0.100
1983 48 18 26 0.20 0.15 0.153 0.150 0.095
1982 26 3 7 0.15 0.18 0.154 0.100 0.094
1981 43 5 19 0.18 0.19 0.162 0.123 0.103
1980 46 16 23 0.20 0.19 0.161 0.150 0.110
* 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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