https://doi.org/10.1351/goldbook.16178
Upper-bound excess lifetime cancer risk estimated to result from continuous exposure to an agent at a concentration of \(\pu{1 \upmu g L-1}\) in water, or \(\pu{1 \upmu g m-3}\) in air.
Note: The interpretation of unit risk is as follows: if unit risk = \(\pu{1.5E-6 \upmu g L-1}\), \(\pu{1.5}\) excess tumors are expected to develop per \(\pu{1000000}\) or \(\pu{E6}\) people if exposed daily for a lifetime to \(\pu{1 \upmu g}\) of the chemical in \(\pu{1 L}\) of drinking water.