California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Ventura 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 41 5 30 0.17 0.14 0.143 0.151 0.112
1997 59 2 46 0.13 0.15 0.154 0.114 0.115
1996 80 17 65 0.16 0.16 0.161 0.127 0.119
1995 90 23 67 0.17 0.16 0.162 0.144 0.117
1994 88 17 64 0.16 0.15 0.147 0.132 0.112
1993 58 13 46 0.15 0.15 0.157 0.129 0.115
1992 68 10 57 0.15 0.15 0.159 0.123 0.118
1991 107 33 92 0.17 0.17 0.164 0.140 0.127
1990 99 18 70 0.17 0.17 0.172 0.143 0.130
1989 116 46 94 0.23 0.17 0.173 0.166 0.132
1988 135 55 110 0.18 0.18 0.176 0.142 0.131
1987 123 31 88 0.18 0.18 0.156 0.153 0.129
1986 149 59 120 0.18 0.18 0.164 0.145 0.131
1985 136 44 111 0.20 0.19 0.157 0.156 0.132
1984 132 45 108 0.19 0.21 0.188 0.158 0.137
1983 125 58 109 0.23 0.22 0.195 0.165 0.143
1982 142 70 123 0.23 0.20 0.198 0.168 0.144
1981 149 85 134 0.23 0.19 0.200 0.170 0.146
1980 140 61 116 0.21 0.23 0.207 0.160 0.153
* 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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