Why would acid rain make corrosion worse?

Acid rain affects buildings and statues made of limestone and marble, primary in to different ways. This is alteration and dissolution. When sulfuric, and nitric acids in polluted air react with the calcite in marble and limestone, the calcite dissolves. In exposed areas of buildings and statues, there are roughened surfaces, removal of material, and loss of carved details. Stone surface material may be lost all over or only in spots that are more reactive. Sheltered areas on limestone and marble buildings show blackened crusts that have peeled off in some places, revealing crumbling stone beneath. This black crust is primarily composed of gypsum. The temperature of the surface of the calcium carbonate, which is a form of limestone and marble, affects how quickly acids react with it. The concentration of acid also affects how quick the reaction is.