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Pathways
Toxicology
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Step 1.1 Identifying Exposure Pathway Categories

bullet Examples

To view examples of the three pathway categories, move your mouse cursor over the map below or click on the active areas.

Eliminated pathway: Arsenic was found in groundwater near a landfill. People who live near the landfill get their drinking water from an uncontaminated municipal water supply. Private wells were not found in the area. No point of exposure is present.
Completed pathway: A residential community was built near a closed landfill. Sampling of soil gas at the landfill and ambient air in the neighborhood found acetone, methylene chloride, and 1,1,2-tricholoroethane. One can assume that the residents are inhaling these chemicals.
Potential pathway: Soil gas samples collected at the landfill and in the nearby community contained concentrations of acetone and methylene chloride. It is possible that these chemicals could get into indoor air. No indoor air samples were collected.

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