California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Nevada 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 0 25 0.12 0.11 0.114 0.099 0.095
1997 10 0 17 0.11 0.11 0.100 0.101 0.089
1996 22 0 29 0.11 0.11   0.104 0.087
1995 3 0 4 0.10 0.10   0.092 0.085
1994 8 0 9 0.11 0.10   0.107 0.077
1993 0 0 0 0.09 0.07   0.078 0.065
1992 2 0 5 0.11 0.11 0.110 0.087 0.088
1991 7 0 7 0.11 0.11 0.118 0.096 0.092
1990 8 2 9 0.15 0.11   0.115 0.094
1989 12 0 11 0.12 0.10   0.107 0.097
* 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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