California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
San Bernardino County Portion
of the Mojave Desert 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 74 24 60 0.20 0.17 0.176 0.144 0.127
1997 95 22 74 0.19 0.18 0.171 0.133 0.124
1996 98 38 83 0.18 0.18 0.186 0.146 0.131
1995 96 33 80 0.24 0.19 0.188 0.170 0.133
1994 137 77 126 0.19 0.19 0.191 0.155 0.138
1993 129 66 121 0.20 0.20 0.194 0.147 0.139
1992 148 75 128 0.23 0.23 0.220 0.165 0.147
1991 132 67 122 0.24 0.23 0.224 0.173 0.151
1990 135 76 118 0.27 0.22 0.215 0.198 0.151
1989 150 91 136 0.22 0.21 0.204 0.161 0.153
1988 148 104 137 0.27 0.23 0.234 0.167 0.165
1987 147 71 135 0.22 0.23 0.231 0.161 0.163
1986 142 94 136 0.26 0.23 0.135 0.225 0.168
1985 138 74 119 0.21 0.22 0.197 0.167 0.150
1984 103 38 86 0.23 0.22 0.193 0.158 0.132
1983 109 48 101 0.23 0.21 0.199 0.182 0.141
1982 105 25 82 0.20 0.21 0.207 0.145 0.143
1981 144 100 131 0.33 0.29 0.214 0.295 0.240
1980 100 52 83 0.26 0.21 0.206 0.176 0.136
* 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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