California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Riverside County Portion
of the Salton Sea Air Basin
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 42 8 31 0.17 0.16 0.153 0.136 0.107
1997 45 4 26 0.16 0.15 0.152 0.117 0.107
1996 60 12 52 0.16 0.16 0.154 0.125 0.111
1995 56 11 34 0.16 0.16 0.153 0.132 0.110
1994 78 13 39 0.17 0.15 0.153 0.130 0.113
1993 82 21 64 0.17 0.17 0.159 0.126 0.118
1992 82 24 66 0.17 0.17 0.168 0.128 0.121
1991 80 24 62 0.18 0.18 0.175 0.148 0.125
1990 82 27 56 0.17 0.18 0.181 0.130 0.126
1989 117 38 90 0.19 0.18 0.180 0.160 0.129
1988 99 35 70 0.20 0.18 0.182 0.137 0.130
1987 85 40 72 0.17 0.18 0.185 0.141 0.131
1986 80 31 62 0.18 0.19 0.197 0.142 0.135
1985 93 28 68 0.24 0.19 0.204 0.160 0.134
1984 100 40 79 0.20 0.19 0.202 0.165 0.134
1983 95 50 77 0.19 0.19 0.194 0.150 0.134
1982 96 38 80 0.19 0.20 0.209 0.142 0.144
1981 131 62 108 0.19 0.20 0.216 0.151 0.149
1980 103 49 87 0.21 0.20 0.219 0.162 0.146
* 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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