| Popis: |
Deposition of anthropogenic air pollutants causes significant incremental damage to economically important construction materials in addition to that caused by natural weathering. This paper discusses the effects of acidic air pollutants as well as those of other factors, such as material properties and climate, which are strongly interrelated with the former. Sulphur dioxide and its transformation products have been identified as the major active anthropogenic species in the atmospheric corrosion of metal structures and building stones. Economic damage due to increased costs of maintenance, repair and replacement are discussed in the second part of this paper. Estimates of the costs for painted and galvanized steel, which have been identified as the economically most important technical materials, range from an annual US $6 per capita in earlier studies to US $2 in more recent ones. |
