California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
San Joaquin 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 19 1 7 0.13 0.12 0.124 0.100 0.087
1997 6 0 3 0.12 0.12 0.122 0.099 0.087
1996 26 2 14 0.14 0.12 0.116 0.096 0.092
1995 16 2 9 0.13 0.12 0.120 0.107 0.091
1994 16 1 6 0.13 0.12 0.117 0.101 0.087
1993 12 1 4 0.13 0.11 0.117 0.097 0.088
1992 21 0 10 0.11 0.12 0.117 0.090 0.088
1991 26 0 10 0.12 0.12 0.114 0.095 0.087
1990 17 1 7 0.13 0.13 0.120 0.102 0.090
1989 10 0 4 0.12 0.13 0.118 0.103 0.093
1988 37 4 21 0.13 0.13 0.122 0.103 0.098
1987 54 1 30 0.16 0.13 0.134 0.110 0.097
1986 31 3 17 0.14 0.14 0.136 0.115 0.101
1985 35 5 24 0.14 0.14 0.131 0.112 0.104
1984 49 4 35 0.15 0.13 0.127 0.114 0.107
1983 32 9 26 0.15 0.13   0.115 0.106
1982 15 1 4 0.13 0.13   0.102 0.091
1981 23 4 14 0.14 0.14   0.117 0.097
1980 27 6 16 0.14 0.16   0.123 0.102
* 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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