A "multi-pollutant exposure programme" reflecting the new pollution situation where SO 2 is no longer the dominating pollutant has been performed by the International Co-operative Programme on Effects on Materials, including Historic and Cultural Monuments (ICP Materials) within the activities of the Convention on Long-range Transboundary Air Pollution. The main results obtained in the period 1997-2003 are summarised. Dose-response functions are presented for carbon steel, zinc, copper, bronze and limestone. Parameters involved in the functions include besides SO 2 and pH, which were included in the previously developed functions from ICP Materials, also the effect of particulate matter and HNO 3 .
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