California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Los Angeles 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 68 36 46 0.22 0.20 0.217 0.171 0.133
1997 90 27 45 0.17 0.21 0.229 0.130 0.135
1996 111 56 74 0.21 0.22 0.230 0.150 0.145
1995 138 88 107 0.22 0.25 0.249 0.158 0.156
1994 143 102 118 0.30 0.28 0.279 0.208 0.168
1993 162 102 112 0.28 0.30 0.297 0.185 0.177
1992 174 129 140 0.30 0.30 0.286 0.218 0.177
1991 160 111 130 0.32 0.31 0.304 0.183 0.179
1990 168 120 133 0.29 0.33 0.310 0.177 0.186
1989 195 140 154 0.34 0.33 0.320 0.235 0.192
1988 206 167 182 0.34 0.34 0.319 0.258 0.205
1987 193 148 166 0.33 0.35 0.344 0.210 0.217
1986 213 164 181 0.35 0.35 0.360 0.251 0.222
1985 203 157 167 0.39 0.36 0.375 0.288 0.226
1984 203 157 168 0.34 0.36 0.354 0.226 0.225
1983 179 146 155 0.39 0.36 0.365 0.258 0.229
1982 182 142 156 0.40 0.39 0.365 0.265 0.233
1981 220 180 187 0.39 0.42 0.401 0.257 0.235
1980 192 156 169 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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