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The Environmental Protection Agency (EPA) is announcing an external expert peer review and public comment for the EPA Multiple-Path Particle Dosimetry (MPPD) Model Software (MPPD EPA 2021 v. 1.01) and its associated ''Technical Support Documentation and User's Guide (External Review Draft)'' ([EPA/600/R– 20/406]). The document was prepared by the Center for Public Health and Environmental Assessment within EPA's Office of Research and Development, with contributions from Applied Research Associates, Inc., and Fred J. Miller, LLC. EPA is seeking comments by external experts and the public on this draft model software version and associated documents.

The Federal Register Notice states: "The external review draft document and model software (MPPD EPA 2021 v.1.01) are not final and do not represent, and should not be construed to represent, any final Agency policy or views. When revising the document and the model software, EPA will consider any peer or public comments submitted during the public comment period specified in this document."

The public comment period began 23 March 2021 and ends 22 April 2021.

To obtain a copy of the external review draft or the associated MPPD software (EPA 2021 v.1.01), contact Eastern Research Group, Inc. (ERG) with the Subject line: MPPD. ERG may also be reached by phone at 781-674-7362.