Polluted humanity: Air pollution leads to the dehumanization of oneself and others

Air pollution is a major global environmental issue, yet its psychological consequences have only started to receive attention from scholars. We examined whether and how air pollution would lead to self- and other-dehumanization. Across one field study and five pre-registered experimental studies, we showed that air pollution increased people's dehumanization of themselves (Studies 1–2b) and others (Study 3a-4). Air pollution also increases people's perceived vulnerability to disease (PVD), including perceived infectability (PI) and germ aversion (GA). Further, across our studies, PI consistently accounted for the effect of air pollution on dehumanization (Studies 2a-4). In addition, our findings also supported the roles of negative affect (Study 2b) and disgust (Study 4) in shaping dehumanization in the face of air pollution. Therefore, air pollution not only impairs our physical health but also influences our perception of humanness. We discussed the implications of these findings for the literature on air pollution and dehumanization.