Aeroallergens are common both outdoors and indoors. For example, exposure to pollens and spores from plant material may occur during time spent outdoors; the pollens and spores may be transported inside offices or other buildings in which additional exposure may occur. Indoors, dust mites, mammals, and fungal growth are examples of sources for aeroallergens. For both indoor and outdoor environments, sources must be recognized,

FIGURE 6-1 Framework for exposure assessment. Source: NRC, 1985.

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