California Air Resources Board California Map with Basin Highlighted
Ozone Data Summaries (1980-1998)
San Joaquin Valley 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 88 39 82 0.17 0.16 0.162 0.136 0.115
1997 110 16 95 0.15 0.16 0.167 0.127 0.115
1996 120 56 114 0.17 0.17 0.164 0.137 0.119
1995 124 44 109 0.17 0.17 0.163 0.134 0.119
1994 118 43 108 0.18 0.16 0.156 0.129 0.111
1993 125 43 104 0.16 0.16 0.162 0.125 0.112
1992 124 29 109 0.16 0.16 0.162 0.121 0.115
1991 132 51 120 0.18 0.16   0.130 0.118
1990 131 45 104 0.17 0.16   0.123 0.119
1989 148 54 133 0.18 0.17 0.168 0.136 0.120
1988 154 74 135 0.19 0.17 0.169 0.127 0.121
1987 151 64 139 0.20 0.17   0.150 0.118
1986 147 59 134 0.18 0.17   0.135 0.117
1985 149 53 127 0.16 0.16 0.163 0.131 0.111
1984 135 61 120 0.17 0.16 0.164 0.136 0.114
1983 105 41 100 0.17 0.17 0.184 0.122 0.116
1982 113 43 108 0.18 0.17 0.187 0.133 0.123
1981 130 69 96 0.18 0.18 0.184 0.148 0.127
1980 124 64 97 0.21 0.18   0.141 0.122
* 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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