California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Yolo 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 10 0 5 0.12 0.11 0.116 0.102 0.087
1997 2 0 1 0.10 0.11 0.111 0.086 0.079
1996 13 0 4 0.12 0.11 0.109 0.104 0.082
1995 9 0 4 0.11 0.10 0.104 0.091 0.078
1994 4 0 0 0.10 0.11 0.106 0.082 0.079
1993 1 1 1 0.13 0.11   0.097 0.080
1992 14 0 7 0.12 0.11   0.096 0.086
1991 4 0 1 0.10 0.10   0.091 0.077
1990 9 1 6 0.14 0.12 0.115 0.105 0.080
1989 3 0 0 0.10 0.11 0.117 0.083 0.085
1988 32 0 12 0.12 0.11 0.117 0.097 0.087
1987 25 3 13 0.14 0.14 0.114 0.127 0.087
1986 12 2 4 0.14 0.13 0.116 0.100 0.086
1985 13 1 6 0.14 0.12 0.116 0.097 0.086
1984 20 2 11 0.14 0.12 0.116 0.097 0.084
1983 13 0 7 0.12 0.13 0.125 0.093 0.091
1982 18 0 12 0.12 0.13 0.132 0.105 0.096
1981 28 4 19 0.13 0.13 0.134 0.115 0.102
1980 23 1 14 0.14 0.13 0.138 0.108 0.102
* 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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