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Using Demographic and Health Surveys from 48 low-income and middle-income countries (N = 432,86, we investigated whether or not the presence of symptoms of acute respiratory infection (ARI) are contingent on environmental vulnerabilities such as the region, the level of ambient air pollution, community orphanhood status, and household poverty among young children under five. In addition, we also examined whether such an effect may be a consequence of socioeconomic development and/or lifestyle. Using multilevel logistic regression models, environmental vul