Methods for Derivation of Inhalation Reference Concentrations (RfCs) and Application of Inhalation Dosimetry
[05/08] Recently it was discovered that the version posted here previously had an incorrect equation listed on page 4-49 in the PDF. When we checked a bound paper copy of the guidance, the equation was different (corrected), it had a different equation number, and it was on a different page. Clearly, we had two different versions of the guidance even though both versions of the guidance have the same reference (EPA/600/8-90/066F; October 1994). After consulting within the IRIS Staff, we determined that the previous version on the IRIS web site was an early version and that corrections had been made before it was published. Many years after the guidance was published, IRIS developed a web site. A copy of the RfC guidance was posted on the IRIS website, but unfortunately it was the wrong version.
If you have a previous copy of the RfC guidance that came from the IRIS website, you may want to replace it with the latest (correct) version available below.
The overview chapter discusses general prinicples of dose-response assessment for noncancer assessment process. Subsequent chapters of the document discuss criteria and information to be considered in selecting key studies for RfC derivation, provide an overview of the respiratory system and its intra- and interspecies variables, and discuss areas of uncertainty and data gaps in relation to the proposed methodology.
This download(s) is distributed solely for the purpose of pre-dissemination peer review under applicable information quality guidelines. It has not been formally disseminated by EPA. It does not represent and should not be construed to represent any Agency determination or policy.
- (40 pp, 106 KB, about PDF)