A cancer IHB is a concentration in ambient air, at or below
which a chemical or defined mixture of chemicals is unlikely to
cause an adverse health effect to the general public when
exposure occurs daily throughout a person's lifetime. Cancer
IHBs are based on unit risk values and the judgment that 1
additional chance in 100,000 of getting cancer in a lifetime is
acceptable. For implementation purposes, cancer IHBs are
typically compared to an annual average concentration of a
chemical or defined mixture of chemicals in air.
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