Abstract

Urban air quality has changed rapidly in recent years, that requiring new research focused on the effects of pollution, both on the environment and on human health, as well as on apparent changes in building surfaces, including historical ones. As is known, permanent exposure to the atmosphere in the urban environment causes degradation processes on the surfaces of natural stone monuments, especially on porous stone surfaces. In these investigations were used samples of porous calcareous rocks similar to the natural stone from the many historical monuments of the Iasi city - Romania. These samples were coating with various commercially hydrophobic solutions. Further, these samples were exposed in the immediate vicinity of a historical monument and an intense road traffic junction. After about six months of exposure, apparent changes in the treated surfaces were compared with untreated control surfaces but subjected to the same environmental conditions over the same time period in order to evaluate the effectiveness of the hydrophobic treatment.

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