It is extremely difficult to determine how much of the deterioration observed on stones is due to “acid rain” since its action is not limited to one mechanism. Rather, it results from the interaction of various mechanisms, many of which also occur in natural weathering.
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Numerous studies have shown that air pollutants can cause deterioration of sensitive materials. This problem is particularly important for buildings and monuments, where materials are chosen for structural support as well as for their aesthetic value.
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The role of air pollutants in the soiling of a limestone building was investigated by measuring pollutant airborne concentrations and deposition at different heights at the Cathedral of Learning in Pittsburgh, Pennsylvania.
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NCPTT will host four interns in its materials research program this summer: Molly McGath, Catherine Arseneaux, Candida D’Avanzo, and Paige Isaacs.
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