FIGURE 4–1 Flow diagram of components for assessing human exposures to air contaminants from environmental tobacco smoke.

Questionnaires are employed in two capacities: (1) to provide information on the physical properties of each environment, including source use parameters, in order to model the concentration of air contaminants in the microenvironment, thus permitting a prediction of air-contaminant concentrations in spaces not monitored; and (2) to provide a simple categorization of exposure levels, such as exposed versus unexposed or none versus low versus high.

Questionnaires have been used to categorize subjects’ exposure to ETS in all studies of risk of chronic lung disease reported to date. Chapter 6 discusses the use of questionnaires to categorize ETS exposures.

Chapter 7 reviews assumptions required to estimate exposure-dose relationships for ETS and gives an approximation to the dose received under a specific situation.

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