Permissible Exposure Limits (PELs): Set by organizations like OSHA, these limits define the maximum concentration of a substance in workplace air. Acceptable Daily Intake (ADI): Used primarily for food additives, this threshold indicates the amount of a substance that can be ingested daily over a lifetime without appreciable health risk. Threshold Limit Values (TLVs): Suggested by the American Conference of Governmental Industrial Hygienists (ACGIH), TLVs are guidelines for exposure limits to various substances in occupational settings.
