California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Merced 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 37 3 35 0.14 0.13 0.131 0.129 0.096
1997 1 0 1 0.10 0.13 0.130 0.095 0.094
1996 44 1 44 0.13 0.13 0.127 0.116 0.102
1995 38 3 36 0.13 0.13 0.124 0.114 0.100
1994 31 0 26 0.12 0.12 0.122 0.107 0.098
1993 22 1 19 0.13 0.12   0.110 0.098
1992 39 0 40 0.12 0.12   0.107 0.099
1991 13 2 12 0.13 0.12   0.111 0.097
1982 48 6 46 0.14 0.13   0.118 0.107
1981 0 0 0 0.07 0.07   0.055 0.047
* 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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