California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Marin 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 0 0 0 0.07 0.08 0.081 0.058 0.051
1997 1 0 0 0.11 0.09 0.087 0.073 0.055
1996 2 0 0 0.11 0.09 0.088 0.081 0.057
1995 0 0 0 0.09 0.08 0.087 0.072 0.055
1994 0 0 0 0.09 0.08 0.080 0.061 0.050
1993 0 0 0 0.08 0.08 0.076 0.061 0.047
1992 0 0 0 0.07 0.06 0.066 0.053 0.042
1991 0 0 0 0.08 0.08 0.074 0.067 0.054
1990 0 0 0 0.08 0.08 0.084 0.062 0.056
1989 0 0 0 0.08 0.09 0.095 0.068 0.060
1988 1 0 0 0.10 0.09 0.094 0.076 0.058
1987 1 0 0 0.10 0.09 0.095 0.076 0.059
1986 0 0 0 0.08 0.10 0.100 0.060 0.063
1985 1 0 0 0.10 0.11 0.103 0.077 0.062
1984 5 0 0 0.11 0.11 0.098 0.083 0.058
1983 2 0 1 0.11 0.09 0.085 0.091 0.051
1982 1 0 0 0.10 0.09 0.087 0.066 0.053
1981 0 0 0 0.09 0.10 0.099 0.051 0.059
1980 1 0 0 0.11 0.12 0.120 0.075 0.069
* 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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