Atmospheric Pollution 1982, Organised by the Institut National de Recherche Chimique Appliquee, Vert-le-Petit, France, in association with the Commission on Atmospheric Environment of the International Union of Pure and Applied Chemistry (IUPAC), the World Health Organization (WHO), the Gesellschaft fur Aerosolforschung (GAe: F) and the Fraunhofer Gesellschaft (Fh: G), Proceedings of the 15th International Colloquium, UNESCO Building