California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1998)
North Coast Unified AQMD
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*
1995 0 0 0 0.06 0.06 0.052 0.052 0.049
1994 0 0 0 0.06 0.06 0.063 0.061 0.051
1993 0 0 0 0.06 0.06 0.053 0.053 0.050
1992 0 0 0 0.07 0.06 0.055 0.061 0.051
1991 0 0 0 0.06 0.06 0.054 0.051 0.051
1990 0 0 0 0.07 0.06 0.053 0.060 0.053
1989 0 0 0 0.05 0.05   0.042 0.041
1988 0 0 0       0.020  
1981 0 0 1 0.09 0.08   0.086 0.072
* 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.
   

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This page last revised on March 26, 1999

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