California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
San Bernardino 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 103 59 91 0.24 0.22 0.224 0.206 0.154
1997 127 55 102 0.21 0.22 0.211 0.143 0.148
1996 135 81 113 0.24 0.23 0.231 0.173 0.161
1995 139 93 116 0.26 0.23 0.232 0.203 0.165
1994 159 115 146 0.27 0.25 0.252 0.192 0.171
1993 177 118 164 0.27 0.25 0.252 0.185 0.177
1992 183 128 170 0.28 0.27 0.266 0.211 0.180
1991 165 116 150 0.29 0.27 0.266 0.203 0.182
1990 163 116 146 0.33 0.28 0.273 0.198 0.185
1989 196 145 176 0.32 0.28 0.277 0.252 0.188
1988 198 157 177 0.35 0.29 0.284 0.250 0.195
1987 185 145 173 0.29 0.32 0.304 0.198 0.200
1986 185 148 171 0.31 0.32 0.321 0.240 0.211
1985 189 139 171 0.34 0.32 0.330 0.252 0.211
1984 197 162 178 0.34 0.32 0.328 0.248 0.210
1983 172 137 149 0.36 0.32 0.322 0.236 0.214
1982 176 137 154 0.32 0.36 0.351 0.255 0.222
1981 210 171 188 0.36 0.39 0.394 0.295 0.251
1980 193 157 170 0.44 0.42 0.401 0.287 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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