California Air Resources Board California Map with Basin Highlighted
Ozone Data Summaries (1980-1998)
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 77 26 68 0.20 0.17 0.176 0.144 0.127
1997 101 22 78 0.19 0.18 0.171 0.133 0.124
1996 108 39 91 0.18 0.18 0.186 0.146 0.131
1995 115 53 105 0.24 0.19   0.170 0.133
1994 137 77 129 0.19 0.19 0.191 0.155 0.138
1993 135 69 124 0.20 0.20 0.194 0.147 0.139
1992 148 76 130 0.23 0.23 0.220 0.165 0.147
1991 135 70 122 0.24 0.23 0.224 0.173 0.151
1990 136 76 120 0.27 0.22 0.215 0.198 0.151
1989 158 93 137 0.22 0.21 0.204 0.161 0.153
1988 151 107 141 0.27 0.23 0.234 0.167 0.165
1987 157 81 143 0.22 0.23 0.231 0.161 0.163
1986 156 105 146 0.26 0.23   0.225 0.168
1985 147 93 129 0.21 0.22   0.167 0.150
1984 131 66 109 0.23 0.22 0.193 0.158 0.132
1983 120 66 105 0.23 0.21 0.205 0.182 0.141
1982 120 38 104 0.20 0.22 0.220 0.145 0.145
1981 159 122 148 0.33 0.29   0.295 0.240
1980 127 85 113 0.29 0.22   0.183 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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