Collaborative work in the Finlayson-Pitts and Tobias groups reveals a surface enhancement in the photochemistry of sodium chloride-sodium nitrate aerosol mixtures. In a recent hot article in PCCP, their research showed that UV photolysis of aerosols containing both nitrate and chloride ions yields significantly more NO₂ than irradiation of pure sodium nitrate aerosols. Molecular dynamics simulations shed light on the experiments showing that the interfacial chloride ions form a double layer with sodium ions, which then attract nitrate ions to the surface. The reduced solvent cage of the near-surface nitrate ions allows for easier escape of photoproducts. The results have implications in coastal urban areas and in the polar regions where sea salt influences the composition of aerosols.