It is well established that emissions from combustion of heavy fuels, light fuels and natural gas cause negative impacts on surrounding environment, including the erosion of antique buildings. This study investigates the effect of emissions from the Khoms Steam and Gas power station on the neighboring ancient city of Leptis Magna, using an air dispersion software (DISPER) to calculate the concentrations of sulfur oxides and nitrogen oxides in archaeological city under the influence of climate variables. The objective of this study is to calculate marble erosion rates caused by the chemical reactions on the surface of selected Marble structures. The study reveals high concentrations of the targeted pollutions on the surface’s columns & status of the city.