California Air Resources Board California Map with Basin Highlighted
Ozone Data Summaries (1980-1998)
South Central Coast Air Basin
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 54 6 41 0.17 0.14 0.143 0.151 0.112
1997 59 3 46 0.14 0.15 0.154 0.114 0.115
1996 82 19 68 0.16 0.16 0.161 0.127 0.119
1995 95 25 70 0.17 0.16 0.162 0.144 0.117
1994 90 17 65 0.16 0.15 0.147 0.132 0.112
1993 63 14 53 0.15 0.15 0.157 0.129 0.115
1992 75 12 63 0.15 0.15 0.159 0.125 0.118
1991 112 35 94 0.17 0.17 0.164 0.140 0.127
1990 105 20 76 0.17 0.17 0.172 0.143 0.130
1989 117 48 97 0.23 0.17 0.173 0.176 0.132
1988 138 56 113 0.18 0.18 0.176 0.142 0.131
1987 126 31 91 0.18 0.18   0.153 0.129
1986 153 63 122 0.18 0.18   0.145 0.131
1985 137 44 111 0.23 0.19   0.156 0.132
1984 133 46 109 0.19 0.21 0.188 0.158 0.137
1983 126 58 109 0.23 0.22 0.195 0.165 0.143
1982 145 72 124 0.23 0.20 0.198 0.168 0.144
1981 151 85 135 0.24 0.19 0.200 0.170 0.146
1980 144 61 117 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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