California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
South Coast AQMD
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 107 60 92 0.24 0.22 0.224 0.206 0.154
1997 144 64 118 0.21 0.22 0.229 0.148 0.148
1996 143 85 117 0.24 0.23 0.231 0.173 0.161
1995 155 99 120 0.26 0.25 0.249 0.203 0.165
1994 165 118 148 0.30 0.28 0.279 0.208 0.171
1993 186 124 164 0.28 0.30 0.297 0.195 0.177
1992 190 143 173 0.30 0.30 0.286 0.218 0.180
1991 184 130 162 0.32 0.31 0.304 0.203 0.182
1990 186 131 162 0.33 0.33 0.310 0.193 0.186
1989 211 158 185 0.34 0.33 0.320 0.252 0.192
1988 216 178 194 0.35 0.34 0.319 0.258 0.205
1987 197 160 179 0.33 0.35 0.344 0.210 0.217
1986 217 167 191 0.35 0.35 0.360 0.251 0.222
1985 207 158 181 0.39 0.36 0.375 0.288 0.226
1984 209 175 190 0.34 0.36 0.354 0.248 0.225
1983 192 153 169 0.39 0.36 0.365 0.258 0.229
1982 198 151 168 0.40 0.39 0.365 0.265 0.233
1981 235 188 200 0.39 0.42 0.401 0.282 0.251
1980 210 167 179 0.49 0.43 0.451 0.336 0.273
* 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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