Introduction

Environmental health risk assessment refers to an exercise where we identify a specific health hazard (that is a potential adverse health outcome) for a specified population who are exposed to a particular toxin, and then we use the literature review and actual measurements to measure how much are they exposed, and given their levels of exposure, what would be their risks of the disease. Accordingly, there are four steps that begin with  a process of identification of the health hazard (Figure \ref{358007}).