California Air Resources Board California Map with Basin Highlighted
Ozone Data Summaries (1980-1998)
Sacramento Valley 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 62 14 60 0.16 0.15   0.137 0.097
1997 25 3 15 0.14 0.13 0.141 0.107 0.097
1996 58 9 44 0.16 0.15 0.154 0.126 0.106
1995 50 11 40 0.16 0.15 0.149 0.128 0.106
1994 60 9 48 0.15 0.14 0.148 0.121 0.104
1993 34 7 22 0.15 0.15 0.159 0.120 0.110
1992 74 14 56 0.17 0.15 0.158 0.122 0.105
1991 68 14 60 0.19 0.15 0.153 0.140 0.105
1990 50 16 44 0.15 0.16 0.162 0.127 0.107
1989 67 8 37 0.17 0.16 0.166 0.133 0.114
1988 98 35 68 0.18 0.16 0.171 0.130 0.114
1987 94 24 73 0.18 0.16 0.168 0.127 0.114
1986 66 24 50 0.17 0.18 0.173 0.125 0.118
1985 59 19 42 0.20 0.18 0.173 0.161 0.118
1984 64 23 46 0.21 0.18 0.162 0.138 0.115
1983 62 15 44 0.17 0.16 0.163 0.125 0.114
1982 66 17 46 0.16 0.16   0.133 0.112
1981 78 22 63 0.18 0.17   0.142 0.115
1980 73 19 62 0.18 0.19   0.132 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.
   

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  |  Map for this Basin  
District/Site Directory  |  County/Site Directory  |  Monitoring Site Directory 
ARB Home Page  |  Search ARB Programs/Topics  |   Email ARB Help Attendant