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This chapter reviews recent developments in sustainability regarding cities of the world. Using the approach of a literature review, this chapter highlights sustainability innovations in the context of cities. The chapter identifies several indexes which assess quality of life (QOL) or prosperity in cities of the world. One web-based index which relies heavily on the inputs of citizens around the world is Numbeo. The literature review identifies ways cities have pursued climate change mitigation through encouragement of electrical vehicles and alternative modes of transportation. Innovations that have become controversial in cities are also identified. Analysis of Numbeo suggests this index shows promise of future value for researchers interested in city QOL—specifically its pollution perceptions index. As urbanization continues with more than half of the world's population now residing in cities, interest in the sustainability of cities will intensify. Sustainability indexes for cities are now being developed. Analysis of Numbeo's novel approach to gauging the pollution of cities through the reports of hundreds of thousands of individuals living around the world suggests that this approach holds promise for future development. While other disciplines have taken focus on city sustainability, this is the first study within the domain of marketing research to provide an overview of city sustainability for marketing researchers and to analyze a new way of measuring a component of city QOL—perceptions of city pollution. Results suggest that valuable results will likely be forthcoming as researches continue developing city sustainability measures and indexes in the future.