California Air Resources Board California Map with County Boundaries
Ozone Data Summaries (1980-1998)
Riverside County Portion
of the Mojave Desert 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*
1993 18 1 16 0.14 0.13   0.108 0.098
1992 0 0 0 0.09 0.08   0.076 0.059
1991 33 6 37 0.13 0.13   0.115 0.099
1990 23 1 18 0.13 0.12   0.102 0.095
1989 31 2 20 0.14 0.13   0.117 0.100
1987 24 3 20 0.14 0.14   0.106 0.098
1986 39 3 30 0.16 0.14   0.105 0.096
1985 19 3 8 0.14 0.11   0.102 0.092
* 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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