California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Madera 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 16 2 13 0.14 0.12   0.116 0.082
1997 0 0 0 0.09 0.08   0.080 0.070
1996 28 2 28 0.13 0.12 0.122 0.111 0.093
1995 16 0 15 0.12 0.13 0.124 0.102 0.093
1994 4 0 1 0.10 0.13 0.121 0.086 0.091
1993 28 6 26 0.15 0.13 0.125 0.110 0.096
1992 15 0 12 0.12 0.11   0.097 0.091
1991 24 2 17 0.13 0.12   0.101 0.093
1990 6 0 13 0.11 0.12   0.098 0.093
1989 15 0 15 0.12 0.12   0.101 0.096
1988 11 1 8 0.13 0.11   0.106 0.097
1981 26 1 26 0.13 0.13   0.117 0.095
* 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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