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Software routines for generating synthetic Fourier transform infrared (FT-IR) spectra and interferograms are documented. Infrared radiative transfer models for passive FT-IR spectroscopy are furnished, providing a basis for simulating realistic spectral data. Laboratory passive FT-IR spectra and interferograms are shown to validate the software performance. Due to variability in reported absorption coefficients, it is found that simulated data are not a replacement for either laboratory or field quantitative measurements. However, the synthetic data capability provides a versatile resource for examining experimental results and a flexible tool for chemometric research into various signal processing strategies for passive FT-IR spectroscopy. The software routines in the "FTIR_Toolbox" are written in MATLAB. Complete program source code listings are provided in the appendix.