From 2001 to 2010, Swerea KIMAB coordinated studies in 14 countries in Asia and Africa as part of the Swedish International Development Cooperation Agency (Sida)-funded programme on Regional Air Pollution in Developing Countries (RAPIDC). The SEI York Centre managed the programme.

This article, the third in a series, presents the results of exposures of carbon steel, zinc and limestone samples in Kathmandu for one year. Their corrosion was measured at 10 locations and related to SO2, NO2, O3, HNO3and PM concentrations, as well as climatic factors. Corrosion rates vary considerably and are correlated mainly with the SO2concentration. Estimated policy targets for SO2are most stringent for limestone, in the range 3 to 6 μg m−3.

The authors find that the Kathmandu carbon steel and limestone samples match a general pattern from exposures across the study sites in Asia and Africa. Corrosion of copper is generally higher than corrosion of zinc, while in Europe, corrosion of zinc has been found to be higher than corrosion of copper.

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