California Air Resources Board California Map with District Boundaries
Ozone Data Summaries (1980-1995)
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
3rd High*
1995 45 4 27 0.15 0.15 0.166 0.107 0.099
1994 79 20 69 0.17 0.14 0.156 0.128 0.095
1993 0 0 0 0.09 0.08   0.079 0.074
* The 3 year 4th high, 3 year average 3rd 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.
** Proposed Federal Standard

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This page last revised on April 5, 1997

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