According to the Environmental Protection Agency

According to the Environmental Protection Agency:

A) a sublinear relationship exists between the amount of exposure to a toxic substance and the effect it has on human health.
B) in the absence of a clear understanding of dose-response relationships at low doses,risk estimates should be based on a sublinear or threshold curve.
C) there should be more regulation to limit human exposure when the risk estimate is based on the linear curve.
D) the higher the inferred risk,the more justification there is for high expenditures to control polluting emissions.