Table 2.

Excess lifetime cancer risk (ELCR) levels based on the Delphi method [13]

Grade I	Extremely low risk	<E-06	Completely accept
Grade II	Low risk	E-06, E-05	Not willing to care about the risk
Grade III	Low-medium risk	E-05,5E-05	Do not mind about the risk
Grade IV	Medium risk	5E-05, E-4	Care about the risk
Grade V	Medium-high risk	E-04,5E-04	Care about the risk and willing to invest
Grade VI	High risk	5E-04, E-03	Pay attention to the risk and take action to solve it
Grade VII	Extremely high risk	>E-03	Reject the risk and must solve it