California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Placer 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 21 5 14 0.15 0.13 0.139 0.119 0.094
1997 10 0 5 0.11 0.13 0.134 0.097 0.095
1996 33 3 27 0.14 0.13 0.139 0.110 0.103
1995 37 3 25 0.15 0.13 0.135 0.119 0.105
1994 37 5 28 0.13 0.14 0.137 0.117 0.103
1993 24 4 17 0.15 0.14 0.138 0.120 0.103
1992 49 8 36 0.17 0.14   0.122 0.105
1991 36 4 29 0.13 0.14   0.115 0.105
1990 42 11 41 0.15 0.15 0.150 0.127 0.107
1989 29 0 24 0.12 0.15 0.148 0.101 0.105
1988 62 14 51 0.18 0.16 0.153 0.138 0.108
1987 41 7 37 0.18 0.15 0.149 0.121 0.105
1986 45 4 36 0.17 0.16 0.153 0.123 0.109
1985 35 8 25 0.18 0.16 0.153 0.127 0.111
1984 39 5 28 0.18 0.15 0.144 0.112 0.104
1983 36 6 24 0.16 0.14 0.142 0.118 0.102
1982 39 4 27 0.16 0.15 0.144 0.130 0.107
1981 51 12 43 0.16 0.15 0.149 0.117 0.109
1980 54 8 48 0.16 0.18 0.180 0.122 0.122
* 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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