California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
San Francisco 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 0.05 0.06 0.059 0.046 0.043
1997 0 0 0 0.07 0.07 0.067 0.059 0.045
1996 0 0 0 0.07 0.07 0.064 0.050 0.046
1995 0 0 0 0.09 0.08 0.065 0.067 0.044
1994 0 0 0 0.06 0.06 0.062 0.045 0.042
1993 0 0 0 0.08 0.06 0.060 0.052 0.042
1992 0 0 0 0.08 0.06 0.058 0.052 0.043
1991 0 0 0 0.05 0.07 0.063 0.047 0.045
1990 0 0 0 0.06 0.07 0.071 0.051 0.049
1989 0 0 0 0.08 0.08 0.075 0.063 0.051
1988 0 0 0 0.09 0.08 0.074 0.070 0.052
1987 0 0 0 0.09 0.07   0.070 0.037
1986 0 0 0 0.07 0.09 0.076 0.056 0.048
1985 0 0 0 0.09 0.09 0.080 0.065 0.048
1984 1 0 0 0.10 0.09 0.078 0.067 0.044
1983 1 1 0 0.13 0.08 0.071 0.073 0.041
1982 0 0 0 0.08 0.08 0.067 0.051 0.043
1981 0 0 0 0.07 0.07   0.040 0.044
1980 0 0 0 0.09 0.09   0.063 0.050
* 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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