Abstract
The appearance of an building exterior material is soild by attaching particles such as the vehicle exhaust emission and dust's on the material surface. Recently, the low pollution type material using the effect of the photocatalyst of titanium was developed as the prevention of soiling. This research deals with the appearance change and effect of cleaning of the low pollution type materials of paint, plastic and tile that exposed outdoor for 36 months. As a result, the effectiveness of the low pollution type material was different depending on the kind of the material.