California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
El Dorado County Portion
of the Lake Tahoe 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 0.08 0.08 0.082 0.077 0.069
1997 1 0 0 0.10 0.08 0.083 0.071 0.068
1996 0 0 0 0.08 0.08 0.084 0.073 0.071
1995 0 0 1 0.09 0.09 0.084 0.089 0.070
1994 0 0 0 0.09 0.08   0.079 0.061
1993 0 0 0 0.09 0.07   0.071 0.056
1992 1 0 0 0.10 0.09 0.089 0.082 0.075
1991 0 0 0 0.09 0.09 0.093 0.081 0.076
1990 0 0 0 0.09 0.09 0.092 0.080 0.075
1989 2 0 2 0.10 0.09 0.091 0.085 0.076
1988 0 0 1 0.09 0.09 0.089 0.085 0.074
1987 0 0 0 0.09 0.09 0.085 0.082 0.071
1986 0 0 0 0.09 0.08 0.082 0.080 0.069
1985 1 0 1 0.10 0.08 0.080 0.086 0.068
1984 0 0 0 0.08 0.08 0.080 0.072 0.067
1983 0 0 0 0.08 0.08 0.086 0.071 0.069
1982 0 0 0 0.09 0.09   0.080 0.070
1981 2 0 0 0.10 0.08   0.082 0.071
1980 0 0 0 0.09 0.09 0.089 0.080 0.070
* 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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