When considering diffusion in model odor perception, the diffusion coefficient can significantly influence predictions about the concentration of fragrance ingredients in the surrounding air. While finding vapor pressure for rare ingredients is challenging, determining the diffusion coefficient in air is even more difficult. Researchers typically rely on predictive correlations derived from noisy experimental data to estimate it. However, as in any estimation process from noisy observations, an irreducible aleatoric uncertainty is associated with the obtained predictive correlation.