California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Orange 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 22 6 6 0.18 0.14 0.141 0.115 0.088
1997 13 3 3 0.13 0.14 0.137 0.100 0.088
1996 27 6 9 0.15 0.16 0.156 0.103 0.100
1995 39 4 8 0.16 0.17 0.163 0.109 0.107
1994 46 9 15 0.25 0.19 0.189 0.172 0.117
1993 59 17 25 0.19 0.19 0.197 0.122 0.114
1992 63 35 35 0.22 0.21 0.205 0.158 0.120
1991 71 32 36 0.25 0.22 0.219 0.145 0.127
1990 80 37 39 0.21 0.24 0.227 0.142 0.138
1989 81 38 44 0.26 0.24 0.235 0.167 0.141
1988 96 45 50 0.29 0.24 0.246 0.195 0.142
1987 81 42 54 0.24 0.26 0.267 0.165 0.152
1986 101 53 62 0.25 0.27 0.274 0.158 0.157
1985 101 63 66 0.34 0.28 0.295 0.208 0.166
1984 107 65 75 0.32 0.29 0.297 0.177 0.163
1983 110 65 73 0.30 0.28 0.290 0.196 0.166
1982 79 42 48 0.32 0.29 0.288 0.211 0.155
1981 107 69 67 0.33 0.31 0.295 0.190 0.162
1980 119 72 73 0.34 0.31 0.332 0.178 0.170
* 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