California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
Calaveras County APCD
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 0.08 0.13   0.071 0.081
1997 6 1 4 0.14 0.13 0.124 0.112 0.093
1996 24 3 18 0.14 0.13 0.123 0.112 0.097
1995 23 1 19 0.15 0.12   0.107 0.096
1994 35 0 34 0.12 0.11   0.108 0.099
* 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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