Abstract
The study of effects of environmental conditions on the deterioration of stonework in Venice was begun in 1971. Daily measurements of the concentrations of some atmospheric pollutants were determined. Aerosol acidity, sulphate paniculate matter, and sulphur dioxide concentrations showed a seasonal trend. The seasonal cycles of the sulphur dioxide concentrations are more marked than the other two, because they are more influenced by the meteorological conditions and urban and industrial heating changes. Moreover, microscopic and microchemical examination showed that in surface cracks caused by the formation of calcium sulphate, a wetting phase with a deep penetration of solutions containing sulphuric acid and sodium chloride takes place. The crystallization of soluble salts, in the drying phase, causes mechanical stresses which break the stone.
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