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A two‐dimensional diffusion model is developed to study the propagation of gas molecules around the moon. The rarefied, ambient, lunar atmosphere is treated as an exosphere, and the model assumes that the gas molecules diffuse along the surface as a result of collisions with the surface. The loss mechanisms considered are interactions with the solar wind and solar photons, thermal evaporation, and adsorption to the lunar surface. Using the exhaust gases from the Lunar Module (LM) as a source, it is shown that during the LM staytime, the contamination of the atmosphere might be appreciable and is nonuniform in distribution with the subsequent trend toward a uniform distribution proceeding at different rates for different exhaust gas species.

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