California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Tuolumne 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 7 0 10 0.12 0.12   0.100 0.090
1997 8 0 7 0.12 0.12 0.112 0.107 0.088
1996 25 0 21 0.12 0.12 0.111 0.108 0.090
1995 9 1 14 0.14 0.10 0.105 0.105 0.087
1994 8 0 9 0.11 0.10   0.094 0.085
1993 5 0 6 0.12 0.10   0.088 0.085
1992 2 0 1 0.10 0.09   0.097 0.083
1991 0 0 0 0.09 0.09   0.078 0.075
1990 0 0 0 0.09 0.08   0.081 0.075
1989 0 0 0 0.09 0.08   0.078 0.075
1988 0 0 0       0.025  
* 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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