California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
Bay Area 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 29 8 16 0.15 0.14 0.151 0.111 0.089
1997 8 0 0 0.11 0.14 0.149 0.084 0.090
1996 34 8 14 0.14 0.14 0.151 0.112 0.093
1995 28 11 18 0.16 0.14 0.135 0.115 0.087
1994 13 2 4 0.13 0.12 0.118 0.097 0.082
1993 19 3 5 0.13 0.12 0.126 0.112 0.081
1992 23 2 6 0.13 0.12 0.130 0.101 0.082
1991 23 2 6 0.14 0.13 0.129 0.108 0.084
1990 14 2 7 0.13 0.13 0.136 0.105 0.088
1989 22 4 13 0.14 0.14 0.148 0.102 0.097
1988 41 5 20 0.15 0.14 0.147 0.101 0.092
1987 46 14 29 0.17 0.14 0.149 0.116 0.092
1986 39 5 13 0.14 0.15 0.155 0.106 0.097
1985 45 9 17 0.16 0.16 0.173 0.127 0.103
1984 55 22 32 0.17 0.16 0.164 0.124 0.100
1983 53 21 26 0.20 0.16 0.153 0.150 0.095
1982 36 5 13 0.15 0.18 0.154 0.108 0.094
1981 51 8 23 0.18 0.19 0.162 0.123 0.103
1980 47 18 24 0.20 0.19 0.166 0.150 0.110
* 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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