Perception of darkening of stone façades and the need for cleaning

This study intends to understand and analyse the visual pollution caused by particle deposition on the stone façades that ultimately cause blackening of buildings and affect the aesthetic value of the façade. The aesthetics is complex and is subjected to differences in opinion between individuals. For the purpose of this study different types of buildings in Amman (residential, commercial, historical and others); have been randomly selected and visually studied by investigating public perceptions of the aesthetic benefits, and value of stone cleaning. An interaction chart relating the darkness level, the deposition patterns and the type of building has been developed in order to assess the priority given by the public to stone façade cleaning decision.