This article proposes an original socio-anthropological method. It presents a new tool, the Theatre Forum, as a complementary way for the accurate analysis of the population environment perception. The fundamental goals and ways of this very specific theatre are explained. The interests and limits of this original method, developed in a scientific approach, are illustrated in the specific context of the dust effects and health impact in Ouagadougou in Burkina-Faso. We present the pertinence of this method as a new anthropological and sociological approach and the large interest for the pluridisciplinary study.