4 How much were people exposed to?

Based on what we know, is the amount of exposure high enough to possibly cause the health outcome?

A chemical may cause a specific health problem in people when people are exposed to a certain amount of it; yet, at low levels it may not cause that problem at all.

• According to existing toxicology studies, what levels of contaminant exposure result in a health outcome?
• Does the available data suggest that the contaminant is present at levels high enough to raise a concern about a specific health outcome?