California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Napa 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 3 1 1 0.13 0.09 0.101 0.099 0.063
1997 0 0 0 0.08 0.10 0.103 0.071 0.067
1996 0 0 0 0.09 0.10 0.107 0.075 0.071
1995 4 1 1 0.13 0.11 0.106 0.096 0.073
1994 0 0 0 0.09 0.09 0.096 0.075 0.066
1993 2 0 0 0.12 0.10 0.099 0.083 0.066
1992 0 0 0 0.09 0.09 0.094 0.070 0.063
1991 3 0 0 0.11 0.10 0.098 0.075 0.064
1990 0 0 0 0.09 0.09 0.100 0.072 0.066
1989 2 0 1 0.10 0.10 0.109 0.085 0.071
1988 1 0 1 0.10 0.10 0.107 0.088 0.070
1987 6 0 0 0.11 0.11 0.106 0.080 0.068
1986 0 0 0 0.09 0.11 0.107 0.067 0.069
1985 3 0 1 0.11 0.11 0.115 0.085 0.073
1984 8 0 2 0.11 0.11 0.112 0.090 0.072
1983 4 0 0 0.11 0.10 0.102 0.081 0.066
1982 0 0 0 0.09 0.11 0.108 0.077 0.069
1981 3 0 0 0.11 0.11 0.109 0.067 0.066
1980 10 0 3 0.12 0.12 0.124 0.088 0.073
* 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