Reference Concentration definition
Reference Concentration or “RfC" means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m(3)), to the human population (including sensitive subgroups) that is likely to be without appreciable risk of deleterious effects during a portion of a lifetime (up to approximately seven years, subchronic) or for a lifetime (chronic).
Reference Concentration means a verified reference concentration developed by the United States environmental pro- tection agency which is an estimate of an exposure of the human population, including sensitive subgroups, to a hazardous air con- taminant that is likely to be without an appreciable risk of deleteri- ous effects during a lifetime. A reference concentration is based on continuous inhalation exposures to the hazardous air contami- nant and is expressed in units of micrograms per cubic meter (µg/m3).
Reference Concentration or "RfC" means an estimate, with uncertainty spanning an order of magnitude, of a continuous inhalation exposure to the human population, including sensitive subgroups, that is likely to be without appreciable risk of deleterious effects during a lifetime. It can be derived from a NOAEL, LOAEL, or BMD, with UFs generally applied to reflect limitations of the data used.
More Definitions of Reference Concentration
Reference Concentration means an estimate of a continuous exposure or a daily exposure to the human population (including sensitive populations) that is likely to be without an appreciable risk of adverse non-cancer effects during a lifetime. The reference concentration can be derived from various types of human or animal data, with uncertainty factors generally applied to reflect limitations of the data used.
Reference Concentration or “S(SRfCS) means an estimate of a daily exposure, in
Reference Concentration or “(RfC)" means an estimate of a daily exposure, in units of milligrams of chemical per cubic meter of air (mg/m(3)), to the human
Reference Concentration or “RfC” means an estimate of the continuous inhalation exposure to the human population, including sensitive subgroups and lifestages, that is likely to be without appreciable risk of adverse effect during a lifetime. The reference concentration is expressed in units of micrograms of hazardous substance per cubic meter of air.