The deterioration of exposed materials includes the corrosion of metals, weathering of stone, darkening of lead-based white paint, accelerated cracking of rubber, and deterioration of various manmade fabrics. Sulfur dioxide accelerates the corrosion of metals, necessitating more frequent repainting of metal structures and bridges. The weathering of stone is attributed to the effects of acidic mists formed in the atmosphere as a result of oxidative processes combined with water vapor. Some types of acidic mists include sulfuric acid, carbonic acid, and nitric acid.
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