California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Mariposa 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 13 0 14 0.11 0.11 0.114 0.103 0.095
1997 7 0 7 0.12 0.11 0.105 0.105 0.095
1996 28 0 30 0.11 0.11 0.108 0.107 0.096
1995 20 0 24 0.11 0.11 0.104 0.103 0.095
1994 10 0 12 0.11 0.11   0.104 0.095
1993 17 0 22 0.12 0.11   0.111 0.096
1992 5 0 7 0.10 0.11   0.095 0.089
1991 19 0 31 0.11 0.11 0.108 0.102 0.088
1990 20 0 20 0.12 0.11   0.096 0.089
1989 2 0 4 0.11 0.09   0.093 0.086
1988 0 0 0       0.020  
1981 0 0 1 0.09 0.09   0.087 0.076
* 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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