California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Stanislaus 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 35 4 29 0.15 0.13 0.132 0.125 0.098
1997 15 0 8 0.12 0.13 0.132 0.100 0.096
1996 39 2 20 0.13 0.13 0.129 0.111 0.096
1995 28 2 21 0.13 0.13 0.127 0.111 0.095
1994 28 0 12 0.12 0.11 0.120 0.100 0.093
1993 19 2 13 0.13 0.11 0.119 0.108 0.095
1992 27 0 11 0.12 0.12 0.118 0.102 0.095
1991 33 0 13 0.12 0.12 0.126 0.102 0.095
1990 32 3 22 0.15 0.13 0.131 0.110 0.099
1989 41 3 26 0.13 0.14 0.142 0.120 0.102
1988 64 5 44 0.14 0.14 0.131 0.126 0.101
1987 77 18 68 0.15 0.14 0.133 0.127 0.103
1986 42 2 27 0.13 0.14 0.133 0.105 0.106
1985 57 10 43 0.15 0.14 0.148 0.122 0.109
1984 56 13 47 0.16 0.14 0.144 0.136 0.102
1983 47 5 36 0.14 0.14 0.140 0.108 0.099
1982 37 0 11 0.11 0.14   0.100 0.097
1981 46 11 27 0.15 0.14   0.126 0.107
1980 22 2 8 0.14 0.14   0.107 0.095
* 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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