Indoor air quality is of increasing concern and the terms “sick building syndrome” or “sick house syndrome” are now creeping into our everyday vocabulary. This is because moderno?cebuildingsandhousesareconstructedfromthe viewpoint of energy conservation with a high degree of air tightness and thermal insulation and with new construction materials, but this occasionally leads to insuffcient consideration for the ventilation of room air [1,2]. To develop methods of coping with this problem of indoor air pollution, a wide range of studies have been performed on emission and diffusion of contaminants from new construction materials [3,4]. The e&ects of indoor air contaminants on health have also been reported [5]. Furthermore, studies of indoor