California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Riverside 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 83 40 68 0.20 0.19 0.188 0.169 0.129
1997 127 39 106 0.19 0.19 0.188 0.148 0.135
1996 113 52 91 0.20 0.20 0.192 0.162 0.140
1995 137 71 102 0.21 0.22 0.207 0.161 0.149
1994 145 90 127 0.25 0.24 0.222 0.208 0.157
1993 159 86 131 0.26 0.24 0.240 0.195 0.165
1992 162 101 138 0.26 0.25 0.251 0.193 0.169
1991 158 99 140 0.24 0.27 0.261 0.196 0.175
1990 153 98 127 0.29 0.27 0.263 0.181 0.177
1989 186 120 156 0.27 0.27 0.269 0.213 0.180
1988 192 133 153 0.28 0.27 0.276 0.241 0.180
1987 177 125 153 0.29 0.29 0.297 0.186 0.191
1986 174 118 149 0.27 0.32 0.308 0.217 0.197
1985 177 132 160 0.35 0.33 0.332 0.230 0.209
1984 183 133 161 0.32 0.33 0.333 0.202 0.201
1983 165 124 137 0.36 0.34 0.335 0.230 0.199
1982 159 116 141 0.35 0.35 0.357 0.211 0.212
1981 212 155 173 0.37 0.35 0.353 0.230 0.231
1980 177 139 159 0.37 0.36 0.361 0.271 0.243
* 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.
   

Please send questions or comments to:

aqdweb@arb.ca.gov

This page last revised on March 26, 1999

Other Pollutants  |  Ozone Home Page  |  Air Basin (Site) Selection Map   
District/Site Directory  |  County/Site Directory  |  Monitoring Site Directory 
ARB Home Page  |   Search ARB Programs/Topics  |   Email ARB Help Attendant