California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
Feather River AQMD
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 14 0.12 0.12 0.120 0.102 0.091
1997 5 0 3 0.11 0.11 0.114 0.092 0.091
1996 28 0 28 0.12 0.11 0.115 0.102 0.096
1995 21 1 17 0.13 0.11 0.120 0.103 0.096
1994 25 0 18 0.12 0.11 0.115 0.100 0.096
1993 13 2 9 0.14 0.11 0.111 0.108 0.097
1992 29 0 13 0.12 0.11 0.108 0.108 0.082
1991 10 0 2 0.11 0.10 0.103 0.095 0.076
1990 2 0 0 0.11 0.12 0.121 0.083 0.082
1989 4 0 2 0.10 0.12 0.123 0.087 0.091
1988 41 2 32 0.15 0.13 0.128 0.103 0.095
1987 23 1 16 0.14 0.12 0.120 0.107 0.093
1986 21 2 12 0.14 0.12 0.125 0.103 0.092
1985 18 0 10 0.12 0.12 0.125 0.097 0.089
1984 22 1 14 0.13 0.13 0.113 0.101 0.089
1983 11 2 5 0.13 0.13   0.108 0.086
1982 10 2 5 0.14 0.10   0.103 0.085
1981 0 0 0 0.09 0.12   0.077 0.066
1980 0 0 0 0.06 0.12   0.045 0.066
* 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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