California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
Monterey Bay Unified 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 10 0 6 0.12 0.11 0.114 0.097 0.086
1997 1 0 1 0.11 0.11 0.112 0.091 0.084
1996 16 0 9 0.12 0.11 0.111 0.101 0.085
1995 8 1 3 0.14 0.10 0.106 0.102 0.081
1994 6 0 1 0.10 0.11 0.107 0.092 0.081
1993 12 0 4 0.11 0.11 0.111 0.087 0.083
1992 9 0 4 0.11 0.11 0.115 0.090 0.084
1991 12 1 3 0.14 0.11 0.114 0.108 0.083
1990 11 0 5 0.12 0.12 0.115 0.095 0.084
1989 10 1 3 0.14 0.14 0.131 0.100 0.090
1988 14 1 6 0.13 0.13 0.105 0.096 0.095
1987 37 5 26 0.15 0.13 0.111 0.113 0.103
1986 1 0 0 0.10 0.10 0.109 0.083 0.078
1985 12 0 5 0.11 0.10 0.113 0.091 0.081
1984 6 0 0 0.10 0.10 0.104 0.083 0.077
1983 7 0 3 0.11 0.11 0.108 0.088 0.081
1982 2 0 0 0.11 0.12 0.095 0.077 0.083
1981 8 2 4 0.14 0.12 0.099 0.113 0.087
1980 15 2 8 0.14 0.12   0.117 0.086
* 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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