Conducting CFD simulations to assess the pollutant reduction capabilities of roadside vegetation barriers is computationally expensive; in addition, urban planners and local communities often lack access and the expertise to conduct those simulations. The Gaussian plume equations have been used to describe pollutant dispersion in various environmental settings. This project aims to parameterizing the Gaussian plume variables using the results of 75 LES simulations to train and test the parameterized Gaussian model. By doing so, a simple mathematical model can be used to describe the pollutant deposition and dispersion for roadside vegetation barriers and provide valuable insight in a time-efficient manner.