CalEnviroscreen Version 1.1 - OEHHA - State of California

CalEnviroScreen 1.1
associated with higher mortality, particularly in the elderly, women and
African Americans (Medina-Ramon, 2008). Some of the relationships
between CalEnviroScreen scores and race are explored in the final
section of the report. Together with PM2.5, ozone is a major contributor
to air pollution-related morbidity and mortality (Fann et al. 2012).
Method o Daily maximum 8-hour average concentrations for all monitoring sites
in California were extracted from CARB’s air monitoring network
database for the years 2007-2009.
o The federal 8-hour standard (0.075 ppm) is subtracted from the
monitoring data to arrive at the portion of the 8-hour concentration
above the federal standard. Only concentrations over the federal
standard from 2007-2009 were used.
o For each day in the 2007-2009 time period, the 8-hour ozone
concentrations over the standard were estimated at the geographic
center of the ZIP code using a geostatistical method that incorporates
the monitoring data from nearby monitors (ordinary kriging).
o The estimated daily concentrations over the standard were averaged
to obtain a single value for each ZIP code.
o ZIP codes were ordered by ozone concentration values and assigned
a percentile based on the statewide distribution of values.
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