California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
San Diego County APCD
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 47 9 33 0.16 0.14 0.135 0.141 0.102
1997 43 1 16 0.14 0.14 0.132 0.112 0.099
1996 51 2 31 0.14 0.14 0.142 0.117 0.104
1995 96 12 48 0.16 0.15 0.148 0.122 0.108
1994 79 9 46 0.15 0.15 0.147 0.121 0.109
1993 90 14 58 0.19 0.15 0.150 0.154 0.112
1992 97 19 66 0.17 0.17 0.164 0.133 0.118
1991 106 27 67 0.21 0.17 0.172 0.145 0.125
1990 139 39 96 0.20 0.19 0.180 0.145 0.129
1989 159 56 122 0.25 0.19 0.186 0.193 0.125
1988 160 45 119 0.25 0.18 0.179 0.156 0.121
1987 127 40 99 0.29 0.18 0.179 0.196 0.124
1986 131 42 81 0.19 0.19 0.179 0.143 0.125
1985 148 50 109 0.22 0.21 0.189 0.168 0.132
1984 146 51 98 0.28 0.20 0.197 0.207 0.126
1983 125 61 101 0.28 0.20 0.188 0.176 0.130
1982 120 47 83 0.23 0.21 0.203 0.162 0.137
1981 192 78 133 0.29 0.29 0.228 0.206 0.141
1980 168 88 138 0.23 0.35 0.234 0.173 0.146
* 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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