"Introduction: This research is based on two French studies of individual and domestic exposure to air pollution ("sentinel of air" study's of APPA and preliminary study of OQAI).the present study analyzes the motivations of these volunteers to accept this type of research, in connection with the representations the air pollution and the risk.The main targets are:1) To study the representations of the air pollution inside and outside housing.2) To analyze the motivations of the volunteers from personal exposure to air pollution. Context: The evaluation of air pollution is often associated various indices like sight (Evans & Tafalla, 1987, Rotton, 1987). In the same way, the sense of smell is often requested when one evokes perception of air pollution (Bonnefoy, 1997; Cavalini, 1992) Moreover, there would be a shift between measured pollution and that perceived by the individuals (Gatersleben & Uzzell, 2001). We spend 80% of our time inside housing and the context of housing can have a double influence on air pollution. The idea that the interior is good, clean, controlled (Serfaty-Garzon, 2003; Dubois, 2004) is opposed to the polluted outdoor (Fischer, 1997). Indeed, housing can be permeable to harmful effects. A study of the complaints (Rozec & Al, 2003) shows the existence of a feeling of intrusion, violation or of incapacity to live as they would like in their home. Method: This research was organized around two successive phases: - some interviews were made to study the majors elements of representations of air pollution (indoor and outdoor), perception of exposure. - we prepared thereafter a questionnaire (127) managed by telephone and by mail. This the questionnaire make up of three folds entailing the representations of air pollution (general, indoors, outdoors), lived of the study on exposure (APPA, OQAI) and the communication on air pollution Conclusion: The findings of this study support that the representations of the air pollution outdoor is linked to health and emotional dimension. The results point out that individuals have discovered various indoor sources of pollution. Moreover, changes in the domestic practices were noted. It seems that the values associated to housing allow fast changes of attitudes. However a significant effort has to be done to provide knowledge on air pollution to better arbitrate choices between risks, costs and benefits. The work to done next: This study must be carried out near general public in order to know if the representations of the air pollution of these volunteers are shared by a broader population. The study of these representations will make it possible to better communicate on air pollution."