A chronic noncancer 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. Noncancer IHBs are used for effects other than
cancer. For implementation purposes, chronic IHBs are
typically compared to an annual average concentration of a
chemical or defined mixture of chemicals in air.
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