Purpose This paper investigates the potential contribution of smart city approaches and tools to sustainable urban development in the environment domain. Recent research has highlighted the need to explore the relation of smart and sustainable cities more systematically, focusing on practical applications that could enable a deeper understanding of the included domains, typologies and design concepts, and this paper aims to address this research gap. At the same time, it tries to identify whether these applications could contribute to the “zero vision” strategy, an extremely ambitious challenge within the field of smart cities. Design/methodology/approach This objective is pursued through an in-depth investigation of available open source and proprietary smart city applications related to environmental sustainability in urban environments. A total of 32 applications were detected through the Intelligent/Smart Cities Open Source (ICOS) community, a meta-repository for smart cities solutions. The applications are analyzed comparatively regarding (i) the environmental issue addressed, (ii) the associated mitigation strategies, (iii) the included innovation mechanism, (iv) the role of information and communication technologies and (v) the overall outcome. Findings The findings suggest that the smart and sustainable city landscape is extremely fragmented both on the policy and the technical levels. There is a host of unexplored opportunities toward smart sustainable development, many of which are still unknown. Similar findings are reached for all categories of environmental challenges in cities. Research limitations pertain to the analysis of a relatively small number of applications. The results can be used to inform policy making toward becoming more proactive and impactful both locally and globally. Given that smart city application market niches are also identified, they are also of special interest to developers, user communities and digital entrepreneurs. Originality/value The value added by this paper is two-fold. At the theoretical level, it offers a neat conceptual bridge between smart and sustainable cities debate. At the practical level, it identifies under-researched and under-exploited fields of smart city applications that could be opportunities to attain the “zero vision” objective.

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Migration has long had an impact on spatial segregation within the metropolitan area of Athens. This process has also been affected by local economic restructuring mechanisms, which, in recent years, have evolved within the context of the 2008 economic crisis. This study attempts to shed light on the evolution of the spatial segregation of immigrants within the metropolitan area of Athens, during a period of a rapid urban transformation, using data from the last two census waves (2001 and 2011). Given that previous evidence indicates both vertical segregation in the immigrant labour market structure and diffused immigrant settlements, the work presented here investigates the ways in which urban migrant structures have evolved through local economic restructuring processes, as well as throughout space. The study presents a set of quantitative urban segregation indicators, covering the aspects of evenness, exposure, concentration, and centralisation. It also captures the most significant occupational changes between different migrant‐status groups (non‐EU and EU immigrants), during a crucial period for Athens. Evidence indicates that there has been an overall raise in immigrant settlement segregation, accompanied by an increased centralisation trend. Moreover, the urban transformation through economic restructuring that took place in Athens, following the general EU trend towards a knowledge‐based economic model, has altered the immigrant labour market structure, leading to vertical segregation patterns, driven by professionalisation.

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