California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Sonoma County Portion
of the San Francisco Bay Area 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 0 0 0 0.07 0.08 0.079 0.054 0.052
1997 0 0 0 0.09 0.09 0.084 0.080 0.054
1996 0 0 0 0.09 0.08 0.085 0.077 0.058
1995 1 0 0 0.10 0.08 0.086 0.077 0.057
1994 0 0 0 0.09 0.08 0.080 0.072 0.058
1993 0 0 0 0.08 0.09 0.081 0.062 0.063
1992 0 0 0 0.09 0.09 0.075 0.080 0.067
1991 3 0 0 0.10 0.10 0.103 0.078 0.072
1990 0 0 0 0.09 0.10 0.102 0.073 0.072
1989 3 0 0 0.10 0.10 0.105 0.083 0.076
1988 2 0 1 0.11 0.10 0.101 0.096 0.071
1987 2 0 2 0.11 0.10 0.102 0.097 0.069
1986 1 0 0 0.10 0.10 0.105 0.078 0.068
1985 3 0 2 0.11 0.10 0.106 0.091 0.068
1984 3 0 2 0.11 0.10 0.100 0.087 0.066
1983 2 0 1 0.12 0.09 0.090 0.088 0.062
1982 0 0 0 0.09 0.11 0.106 0.071 0.072
1981 0 0 0 0.09 0.11 0.112 0.063 0.077
1980 9 0 5 0.12 0.12 0.132 0.095 0.087
* 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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