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ANALYZE EXISTING DATA ON PM COMPOSITION TO IDENTIFY KEY FACTORS WHICH INFLUENCE HUMAN EXPOSURES TO PM CONSTITUENTS
The primary objectives are:
1) to complete the validation and development of exposure databases resulting from the NERL PM panel studies (data produced under TDs 5676 and 3937),
2) to perform analyses on these databases and identify key factors that have the potential of influencing human exposures to PM constituents, and
3) to summarize and report the findings of these additional analyses.
An association has been demonstrated between ambient particulate matter (PM 2.5 and PM 10) concentrations and human morbidity/mortality. However, little is known regarding the most important sources of PM exposure, interpersonal and intrapersonal variability in exposure, and the relationship between personal exposure and ambient exposure estimates based on central site monitoring. The NERL in association with a series of cooperating universities is currently analyzing data from several recent longitudinal panel studies to address these uncertainties and to evaluate the important determinants of PM exposure for different subpopulations, area of the country, air sheds, housing structures, and life styles. Under this task, additional analyses will be performed using the data collected previously under tasks 5676 and 3937.