California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Los Angeles County Portion
of the South 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 68 35 46 0.22 0.20 0.217 0.171 0.133
1997 89 27 43 0.17 0.21 0.229 0.130 0.135
1996 109 55 68 0.21 0.22 0.230 0.150 0.145
1995 127 79 92 0.22 0.25 0.249 0.158 0.156
1994 142 102 118 0.30 0.28 0.279 0.208 0.168
1993 158 102 108 0.28 0.30 0.297 0.185 0.177
1992 174 129 139 0.30 0.30 0.286 0.218 0.177
1991 159 111 128 0.32 0.31 0.304 0.183 0.179
1990 168 120 131 0.29 0.33 0.310 0.177 0.186
1989 192 140 150 0.34 0.33 0.320 0.235 0.192
1988 205 165 180 0.34 0.34 0.319 0.258 0.205
1987 190 145 156 0.33 0.35 0.344 0.210 0.217
1986 209 162 177 0.35 0.35 0.360 0.251 0.222
1985 201 154 164 0.39 0.36 0.375 0.288 0.226
1984 196 153 160 0.34 0.36 0.354 0.226 0.225
1983 178 146 154 0.39 0.36 0.365 0.258 0.229
1982 180 142 153 0.40 0.39 0.365 0.265 0.233
1981 216 178 180 0.39 0.42 0.401 0.257 0.235
1980 189 151 161 0.49 0.43 0.451 0.336 0.262
* 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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