California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
El Dorado County Portion
of the Mountain Counties 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 31 5 25 0.16 0.14 0.147 0.127 0.103
1997 19 1 16 0.15 0.12 0.130 0.106 0.099
1996 41 3 36 0.14 0.13 0.133 0.113 0.103
1995 32 1 31 0.13 0.12 0.131 0.113 0.099
1994 26 2 22 0.13 0.12 0.127 0.104 0.097
1993 10 0 12 0.12 0.12   0.108 0.095
1992 29 0 29 0.12 0.12   0.112 0.098
1989 21 2 24 0.13 0.12   0.110 0.103
* 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