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This paper examines the spatial distributions of industrial facilities emitting toxic substances in the Phoenix, Arizona metropolitan region. The analysis relies on geographic information system mapping of hazardous facilities listed in the Environmental Protection Agency's Toxic Release Inventory (TRI) to assess the spatial distribution of polluting industries in relation to the demographic composition of host neighborhoods. The research addresses four questions: (1) Are there differences between the socioeconomic characteristics of neighborhoods with and without polluting industrial facilities? (2) Is there a relationship between the volume of toxic chemicals released from industrial facilities and the socioeconomic characteristics of host neighborhoods? (3) Is there a relationship between the toxicity of the chemicals released from industrial facilities and the socioeconomic characteristics of those living in …