California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Siskiyou 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 0.08 0.08   0.071 0.061
1997 0 0 0 0.08 0.07   0.074 0.058
1996 0 0 0 0.07 0.07   0.063 0.059
1995 0 0 0 0.07 0.07 0.074 0.062 0.057
1994 0 0 0 0.08 0.07   0.068 0.058
1993 0 0 0 0.07 0.07   0.070 0.051
1992 0 0 0 0.08 0.08   0.073 0.057
1991 0 0 0 0.05 0.08   0.046 0.059
1990 0 0 0 0.08 0.08   0.076 0.067
1989 0 0 0 0.08 0.08 0.083 0.076 0.069
1988 0 0 0 0.08 0.08 0.082 0.071 0.069
1987 0 0 0 0.09 0.08 0.081 0.081 0.069
1986 0 0 0 0.08 0.08   0.070 0.064
1985 0 0 0 0.08 0.07   0.075 0.061
1984 0 0 0 0.08 0.07   0.066 0.059
1983 0 0 0 0.07 0.07   0.062 0.056
1982 0 0 0 0.07 0.07   0.066 0.056
1981 0 0 0 0.06 0.06   0.057 0.051
* 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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