The Environmental Protection Agency (EPA) is seeking sources for a project that involves coupling the EPA's Multiple Path Particle Dosimetry (MPPD) v.2.0 model with Computational Fluid Dynamics (CFD), Computational Particle Fluid Dynamics (CPFD), and Physiologically Based Pharmacokinetic (PBPK) models. The objective of this procurement is to enhance the modeling capabilities for assessing particle behavior and exposure, which is critical for environmental health research and regulatory assessments. This initiative falls under the NAICS code 541715, focusing on research and development in the physical, engineering, and life sciences, and is categorized under general science and technology R&D services. Interested parties can reach out to Matthew Growney at growney.matthew@epa.gov or call 513-487-2029 for further details regarding this sources sought notice.