California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Riverside 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 80 40 65 0.20 0.19 0.188 0.169 0.129
1997 127 39 106 0.19 0.19 0.188 0.148 0.135
1996 107 50 84 0.20 0.20 0.192 0.162 0.140
1995 134 69 99 0.21 0.22 0.207 0.161 0.149
1994 144 90 127 0.25 0.24 0.222 0.208 0.157
1993 157 86 124 0.26 0.24 0.240 0.195 0.165
1992 159 99 135 0.26 0.25 0.251 0.193 0.169
1991 155 99 132 0.24 0.27 0.261 0.196 0.175
1990 150 97 122 0.29 0.27 0.263 0.181 0.177
1989 182 119 148 0.27 0.27 0.269 0.213 0.180
1988 191 133 152 0.28 0.27 0.276 0.241 0.180
1987 175 125 151 0.29 0.29 0.297 0.186 0.191
1986 174 118 146 0.27 0.32 0.308 0.217 0.197
1985 177 132 159 0.35 0.33 0.332 0.230 0.209
1984 182 132 156 0.32 0.33 0.333 0.202 0.201
1983 163 123 136 0.36 0.34 0.335 0.230 0.199
1982 157 116 138 0.35 0.35 0.357 0.211 0.212
1981 208 153 169 0.37 0.35 0.353 0.230 0.231
1980 176 139 157 0.37 0.36 0.361 0.271 0.243
* 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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