California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Los Angeles 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 24 8 18 0.16 0.14   0.118 0.097
1997 14 0 7 0.12 0.13   0.101 0.098
1996 40 1 18 0.13 0.14 0.138 0.104 0.103
1995 92 34 70 0.19 0.17 0.148 0.154 0.130
1994 62 10 33 0.14 0.16 0.161 0.112 0.113
1993 59 14 36 0.16 0.16 0.159 0.127 0.113
1992 78 25 53 0.17 0.16 0.154 0.137 0.110
1991 62 8 39 0.14 0.14   0.111 0.105
1990 52 7 36 0.15 0.17   0.106 0.105
1989 95 27 65 0.21 0.17 0.181 0.147 0.123
1988 105 44 91 0.18 0.18 0.187 0.131 0.128
1987 105 32 76 0.17 0.19 0.191 0.140 0.132
1986 108 47 79 0.20 0.19 0.187 0.150 0.134
1985 106 58 85 0.19 0.18 0.185 0.147 0.132
1984 110 49 85 0.18 0.18 0.176 0.141 0.124
1983 93 42 66 0.18 0.20 0.205 0.146 0.133
1982 82 25 57 0.16 0.22 0.220 0.127 0.145
1981 133 82 121 0.21 0.22 0.227 0.168 0.152
1980 106 61 83 0.29 0.22   0.183 0.115
* 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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