Environmental noise is a major environmental concern in metropolitan cities. The rapid social and economic growth in the 20th century is not always accompanied by adequate land planning and environmental management measures. As a consequence of rapid urbanization processes, cities are facing an increase in noise pollution. Noise is being recognized as a serious environmental problem and one which must be accounted for in a sustained development policy designed to improve the quality of life for citizens. Therefore, the monitoring of noise is a crucial aspect of urban planning to allow urban planners to create harmonious and livable environments for communities worldwide. This research aims at assessing the noise levels and associated sources of noise in downtown areas through the involvement of crowdsourcing techniques. The incorporation of noise mapping and increased public awareness are achieved by a framework that enables a comparative scheme between two cities: Alexandria, Egypt and Zagreb, Croatia. The methodology depends on combining crowdsourcing techniques using mobile applications and geographic information system (GIS) tools to detect and analyze noise. Finally, this research provides a comparison between the two cities using the adopted methodology and introduces recommendations to enhance urban planning decisions.

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Public open spaces1 (POS) are fundamental to urban resilience, providing multifunctional, adaptable environments capable of addressing intensifying climatic challenges. As climate change accelerates, designing climate-resilient public open spaces2 (CRPOS) through active community involvement has become a planning imperative. Recent innovations have introduced ‘phygital’ methodologies integrating physical spatial interventions with digital technologies, including participatory geographic information system, digital twins, sensor networks, augmented reality, and online engagement platforms, enabling real-time feedback, simulation, and broader stakeholder inclusion. Despite substantial independent literature on POS design, climate adaptation, and smart-city technologies, research systematically examining how phygital approaches support CRPOS co-production through integrative participatory governance frameworks remains limited. This study conducts a structured scoping review critically synthesising literature at the intersection of POS co-production, climate resilience, and digitally mediated participation. Using a PRISMA-guided screening protocol alongside thematic, content, and narrative analyses, the review systematically maps prevailing themes, digital tools, and knowledge gaps. From 346 studies published between 2010 and 2024 across Scopus and Web of Science, 74 met the inclusion criteria. Findings illuminate how co-production, co-design, and co-creation collectively shape adaptive, inclusive public environments under climate stress, culminating in an integrative framework linking digital innovation, on-site engagement, and climate adaptation strategies.