Two low durability model glasses, Si-Na-K and Si-Ca-K, were exposed sheltered from rain to the atmospheric pollution in Paris in 1997-1998. Two samples series of these glasses were exposed 12 and 3 months, respectively, during periods of time having contrasted atmospheric conditions. Parallel to the exposure of the glasses meteorological and gaseous pollution data were collected. A preliminary study by analytical scanning electron microscopy allowed characterisation of the elemental chemical composition of the neocrystallisations developed on the surface of the glasses: their cationic content is characteristic of the underlying content of the glass mobile cations. An analytical protocol was developed in order to characterise precisely and to quantify the ionic content of the water soluble fraction of the neocrystallisations.
