California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
San Luis Obispo 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 25 1 21 0.13 0.11 0.116 0.113 0.085
1997 0 0 0 0.09 0.11 0.109 0.077 0.078
1996 14 1 10 0.14 0.11 0.108 0.117 0.080
1995 7 0 1 0.11 0.10 0.098 0.087 0.074
1994 2 0 1 0.10 0.10 0.096 0.089 0.074
1993 4 0 2 0.10 0.10 0.099 0.088 0.075
1992 3 0 1 0.11 0.10 0.087 0.098 0.078
1991 4 0 2 0.11 0.11 0.093 0.101 0.083
1990 2 0 0 0.10 0.10 0.095 0.082 0.075
1989 8 1 8 0.15 0.10 0.096 0.122 0.073
1988 6 0 1 0.10 0.10 0.099 0.086 0.075
1987 3 1 2 0.13 0.10 0.097 0.111 0.072
1986 5 0 3 0.10 0.10 0.098 0.096 0.072
1985 3 0 1 0.11 0.11 0.101 0.088 0.075
1984 2 1 2 0.16 0.10 0.099 0.093 0.075
1983 7 0 3 0.11 0.10 0.099 0.093 0.072
1982 2 0 0 0.10 0.10 0.095 0.082 0.072
1981 2 0 1 0.10 0.10 0.101 0.092 0.074
1980 9 0 2 0.10 0.11 0.111 0.087 0.078
* 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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