Environmental health encompasses the assessment and control of those environmental factors that can potentially affect human health, such as radiation, toxic chemicals and other hazardous agents. It is often assumed that the assessment part is just a matter of scientific research, and the control part a matter of implementing standards which unambiguously follow from that research. But it is less commonly understood that environmental health also requires addressing questions of an ethical nature.

How can we determine the -acceptable- risk level for the general population or for...