The predictive perfume diffusion and odor intensity models contain parameters/variables (T, P, D i,air (T, P ), P Sat (T ), γ(x, T ), T hr i , A l,g ) that must be known to be used for predictions. These quantities contain uncertainty as they are estimated from direct or indirect noisy observations. This section describes the methodology used to quantify uncertainties using probability theory and the method to propagate them through the simulator.