The effects of acid rain on stone. Face of a stone gargoyle, badly corroded by centuries of rain and, more recently, acid rain. Limestone features such as these are particularly prone to acid attack. Normal rain is slightly acidic, mainly carbonic acid. In post-industrial societies, however, sulphuric and nitric acids are normally present. Sulphuric acid comes from sulphur oxides generated by industry and fossil- fuel power stations. Nitric acid comes from motor vehicle exhaust fumes as nitrogen oxides. Photographed in Paris.

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