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Inhalation exposure
Inhalation is a major route of exposure that occurs when an individual breathes in polluted air which enters the respiratory tract. Identification of the pollutant uptake by the respiratory system can determine how the resulting exposure contributes to the dose. In this way, the mechanism of pollutant uptake by the respiratory system can be used to predict potential health impacts within the human population.
==Definition==
Inhalation exposure is the concentration of the airborne pollutant in the air at the mouth and nose boundary. An assumption is that this concentration is inhaled by the person. The contact boundary, a particular nasal or oral region, is selected by the analyst.
Intake dose is the mass of the pollutant that crosses the contact boundary and is inhaled by the individual. Some of this pollutant is exhaled, and the fraction that is absorbed by the respiratory system is known as the absorbed dose. A portion of the pollutant may also be expelled by sneezing, coughing, spitting, or swallowing. The remaining pollutant that is transported through the liquid layer, making contact with the respiratory tract tissues is the fraction of bioavailability, called the effective dose.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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