California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Fresno 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 77 30 69 0.17 0.16 0.162 0.134 0.115
1997 95 13 75 0.15 0.15 0.153 0.127 0.111
1996 96 31 78 0.15 0.15 0.154 0.123 0.107
1995 81 22 63 0.17 0.14 0.152 0.126 0.108
1994 65 14 55 0.14 0.15 0.156 0.111 0.107
1993 81 19 59 0.16 0.16 0.162 0.121 0.111
1992 86 25 69 0.16 0.16 0.162 0.121 0.108
1991 94 30 81 0.18 0.16 0.152 0.130 0.110
1990 79 14 55 0.15 0.15 0.158 0.117 0.110
1989 109 24 92 0.15 0.16 0.161 0.121 0.115
1988 130 47 113 0.19 0.17 0.168 0.125 0.121
1987 127 43 112 0.20 0.17 0.170 0.150 0.118
1986 118 39 94 0.18 0.17 0.163 0.135 0.117
1985 112 34 85 0.16 0.16 0.160 0.131 0.110
1984 109 42 100 0.17 0.16 0.164 0.125 0.114
1983 82 27 72 0.17 0.17 0.184 0.122 0.116
1982 79 26 66 0.18 0.17 0.187 0.127 0.123
1981 95 36 77 0.18 0.18 0.184 0.126 0.123
1980 104 54 83 0.21 0.18 0.181 0.141 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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