Abstract
In 1988, Samples of building stone were left at Lough Navar, Northern Ireland, as part of the U.K. National Exposure Programme for building materials. This site was chosen for its rural location to the west of the U.K. mainland where it is upwind of transnational pollution carried by prevailing westerly winds. A study of buildings in nearby Enniskillen suggests, however, that stone decay can be accentuated in response to high local pollution levels. Away from urban centres, decay also occurs. This may be a response to sea salts in precipitation and 'background' anthropogenic pollution. The widespread occurrence of stone decay suggests that care must be taken when using this area as a datum for assessing stone decay related to atmospheric pollution. Ultimately, it also questions whether any site in Western Europe can be considered as 'clean' for this purpose. In an environment where salt weathering is prevalent it is also urged that caution is exercised in the use of exposure trials for monitoring long-term decay that are designed primarily to investigate solution loss.
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