The work forms part of the OLADAPT project, funded by Spain’s Ministry of Science, Innovation and Universities, and is being conducted in collaboration with the Polytechnic University of Madrid, the University of Extremadura and the UNESCO Chair in Sustainable Development and Environmental Education at the EHU. The researchers aligned their approach with the guidelines of the Intergovernmental Panel on Climate Change, which frame climate risk as the product of hazard, exposure and vulnerability. In the case of urban heat, that framing matters enormously, because the hazard itself—the temperature a given area experiences—is only one ingredient in the equation. How a city is built, which areas are hardest hit by high temperatures, and how many people are exposed and how little protection they have, all combine to determine the real risk to human health, thermal comfort and the liveability of urban spaces.

“We are looking at how to conduct a multi-dimensional and multi-scale assessment of the risk posed by heatwaves in urban areas. The risk posed by heatwaves is not measured solely by temperature; it has multiple dimensions,” explains Irantzu Álvarez, a researcher in the SAREN group, which is led by Leire Garmendia. That multidimensional perspective is what distinguishes the new methodology from coarser city-level assessments. Rather than treating a municipality as a single unit of analysis, the team measured vulnerability at the level of individual buildings and open public spaces, generating fine-grained vulnerability maps that reveal hotspots of risk that would otherwise remain invisible in aggregate statistics.

Building the maps required assembling a large volume of data drawn from a variety of sources. The researchers incorporated socioeconomic variables describing the people who live and work in each location, detailed characteristics of the buildings themselves, and environmental variables capturing the conditions of the surrounding urban environment. This combination is crucial, because sensitivity to heat depends on both the physical fabric and the human context. “A building may be sensitive to heat, but its residents may have the financial means to protect their home from it,” the researchers explain. In other words, a thermally poor building occupied by wealthy residents may pose less of a welfare problem than a marginally better building occupied by people with no means to install cooling, improve insulation or otherwise shield themselves from extreme temperatures.

The study’s most consistent finding across all three cities is the weight of socioeconomic variables in determining vulnerability. “People on low incomes, older people, etc. are far more vulnerable,” the research group states. This pattern held in Bilbao, Madrid and Cáceres despite their very different climates, suggesting that the social gradient of heat risk is a structural feature of Spanish cities rather than an artefact of any particular climate zone. Just as importantly, the analysis showed that vulnerability is not uniform within a city, and may even vary substantially within a single neighbourhood. It is therefore not enough, the researchers argue, to declare one city more vulnerable than another; detailed, building-by-building analysis is needed to locate the specific hotspots where intervention will save the most people from harm.

The choice of the individual building as the unit of analysis is what gives the methodology its practical power for municipal decision-making. “This methodology shows which buildings or types of buildings should be renovated or adapted first,” say Álvarez and Laura Quesada, the two researchers who spearheaded the analysis. Quesada is an architect specialising in the restoration and conservation of historic heritage and works at the Vitoria-Gasteiz School of Engineering, while Álvarez is a Technical Engineer in Surveying with a degree in Geography, based at the Bilbao School of Engineering; both lecture on the Master’s Degree in Construction Engineering at the Bilbao School of Engineering. Their combined expertise reflects the interdisciplinary character of the work, which spans building physics, urban geography and social science.

A second layer of the methodology links the vulnerability of buildings to that of the open public spaces around them. The researchers measured the impact of the surrounding environment on each building, capturing factors such as green cover and shade. “Buildings may be highly vulnerable but have plenty of green areas and shade around them. Taking all of this into account means that adaptation measures can be implemented in different ways,” the team explains. A vulnerable building in a leafy, shaded street may call for a different response than an equally vulnerable building on a hot, exposed plaza. By treating buildings and open spaces as an interconnected system rather than as separate problems, the maps allow planners to design adaptation strategies that operate at the scale of the streetscape as well as the individual structure.

The practical output of the methodology is a set of urban vulnerability maps that clearly indicate where priority action should be taken to tackle heatwaves. “Adaptation measures can be implemented much more effectively with this type of study,” the researchers say. For municipalities operating under tight budgets, this kind of prioritisation is invaluable: rather than spreading resources thinly across an entire city, officials can target renovation programmes, shading installations, green infrastructure and social support towards the buildings and neighbourhoods where the combination of physical exposure and social vulnerability is greatest. The maps thus translate abstract climate risk assessments into concrete, spatially explicit guidance.

Demonstrating the approach in three cities with distinct climates also served as a test of its transferability. “The methodology is fully replicable; it can be used anywhere. This makes the methodology more robust. It is a genuinely useful tool for municipalities and cities,” the group states. The successful application in Bilbao, Madrid and Cáceres suggests that the framework could be adopted by other cities facing intensifying heat risk, both in Spain and further afield, provided comparable socioeconomic, building and environmental data are available.

The broader context for this research is the steady escalation of extreme weather under climate change. Heatwaves are becoming more frequent and more severe, with direct consequences for public health, thermal comfort and the overall liveability of cities. Because urban populations are concentrated and much of the built fabric is long-lived, the decisions cities make now about which buildings to retrofit and which public spaces to green will shape heat resilience for decades. By demonstrating that vulnerability is a local, block-by-block phenomenon shaped jointly by poverty, age, building quality and the surrounding environment, the SAREN team’s work offers city governments a rigorous, replicable way to direct adaptation resources where they will matter most—and a reminder that the people least able to protect themselves from extreme heat are often concentrated in the very places that need help first.

Subject of Research: Multiscale GIS-based assessment of urban heatwave vulnerability in Spanish cities

Article Title: Vulnerability to heatwaves varies greatly from one area to another within cities

Article References: Vulnerability to heatwaves varies greatly from one area to another within cities. (n.d.). Original publication

Image Credits: AI Generated

DOI: Not provided

Keywords: heatwaves, urban vulnerability, climate adaptation, socioeconomic factors, buildings, public spaces, GIS mapping, Bilbao, Madrid, Cáceres, IPCC, urban resilience

The research team set out to test a proposition that urbanists have debated for decades: does changing the built environment actually change how safe people feel, and does it do so equitably across genders? Rather than relying on a single case study, the investigators synthesized evidence on design interventions, ranging from improved lighting and sightline management to the activation of vacant spaces and the redesign of pedestrian routes, and evaluated how these measures influenced reported fear of crime among men and women. Their analysis points to a consistent pattern: well-executed interventions reduce fear, but the size and character of that reduction depend on the specific needs and experiences of the users being considered.

At the technical heart of the study lies the distinction between crime itself and the perception of crime. Official victimization statistics capture only a fraction of the ways in which insecurity structures urban life. Fear of crime operates continuously, altering route choices, compressing the hours during which people feel comfortable outside, and imposing what researchers call a mobility tax, an invisible cost paid disproportionately by women. The study emphasizes that fear is not irrational; it is shaped by cues in the environment, including darkness, enclosure, visual isolation, signs of neglect, and the absence of other people. Because fear responds to environmental cues, it is, in principle, modifiable through design.

Lighting emerges as one of the most robust levers. The evidence reviewed indicates that improvements to the quality, uniformity, and placement of lighting can substantially lower fear, particularly along walking routes, transit access points, and underpasses where darkness compounds other stressors. But the authors caution against treating lighting as a panacea. Uniformly bright floodlighting can create glare, deepen shadows at their edges, and signal that a space is dangerous enough to require fortification. Gender-sensitive design, by contrast, treats lighting as part of a broader legibility strategy: illuminating the paths people actually take, lighting entrances and vertical circulation in parking structures and stations, and ensuring that light reaches eye level, where faces become recognizable and social presence becomes perceptible.

Sightlines and spatial configuration form a second pillar of the findings. Enclosed, convoluted spaces with limited visibility, under bridges, behind walls, along blank facades, reliably generate higher fear scores, especially among women respondents. Interventions that open up views, remove visual obstructions, introduce passive surveillance through overlooking windows and active street frontages, and avoid dead-end configurations reduce the sense of being trapped or unobserved. The study frames this in the language of prospect and refuge: people feel safest where they can see and be seen, while potential threats thrive in spaces that offer concealment. Design that maximizes prospect while minimizing anonymous refuge aligns the geometry of a place with the psychology of its users.

A third strand concerns activity and social presence. Vacant lots, boarded storefronts, and empty plazas communicate abandonment, and abandonment is read as risk. Interventions that activate space, through markets, food vendors, community programming, or simply through design that invites lingering, such as seating, shade, and accessible amenities, populate places with the ordinary social traffic that reassures passersby. The study notes that this mechanism is deeply gendered: women’s fear often centers on social disorder and the absence of help rather than on the statistical probability of assault, so interventions that increase the visible presence of other people, and especially of people likely to intervene, deliver fear reduction that lighting alone cannot achieve.

What distinguishes this analysis is its insistence that interventions be evaluated through a gender lens rather than assumed to be gender-neutral. Women and men report fear of crime at different intensities, in different locations, and in response to different cues. Men’s fear tends to concentrate around specific hotspots and nighttime contexts, whereas women report a more diffuse, ambient insecurity that shapes everyday routines, including during daylight hours. Interventions that reduce fear for men may leave this ambient anxiety untouched if they address only the most conspicuous hazards. The study therefore advocates participatory safety audits, in which women residents walk routes, identify stress points, and co-produce design responses, as a methodological complement to top-down planning. Gender-sensitive urbanism, in this framing, is not a niche concern but a diagnostic discipline that reveals where generic design fails.

The policy implications are considerable. Fear of crime suppresses the use of public transport, discourages walking and cycling, and depresses the economic life of streets after dusk. Because fear concentrates along predictable spatial patterns, poorly lit transit approaches, isolated underpasses, blank-walled corridors, municipalities can target investments with precision, achieving fear reduction at costs far below those of major infrastructure projects. The study’s gender-sensitive framing also gives cities a defensible basis for prioritizing interventions: if women’s mobility is constrained more severely than men’s, then design that disproportionately benefits women’s freedom of movement produces the largest gains in aggregate urban access and equity.

The authors are careful to delineate limits. Fear reduction is not crime reduction, and the two must not be conflated. Design interventions can redistribute offending toward less protected targets, a displacement effect that requires monitoring, and they cannot substitute for policing, social services, or the structural reforms that address violence at its roots. Moreover, perception studies must be interpreted with care, since reported fear reflects cultural context, media exposure, and personal history as much as physical environment. Yet the core result stands: when cities change the cues that environments emit, the people who move through them report feeling measurably safer, and the benefits can be tracked and differentiated by gender.

Ultimately, the study reframes fear of crime as a designable variable rather than a fixed feature of urban life. Streets that are lit where people walk, legible where they turn, watched where they linger, and animated where they pass through are not merely more pleasant; they extend the practical freedom of the people, and especially the women, who have long paid the mobility tax of urban insecurity. In an era when cities compete for density, sustainability, and livability, the evidence assembled here makes the case that gender-sensitive urban design is one of the most cost-effective instruments available for reclaiming the public realm for everyone.

Subject of Research: Gender-sensitive effects of urban design interventions on fear of crime in public spaces

Article Title: Urban design interventions reduce fear of crime in public spaces in gender-sensitive ways

Article References: Navarrete-Hernandez, P., Schlesser, T., & Luca, D. (2026). Urban design interventions reduce fear of crime in public spaces in gender-sensitive ways. Nature Cities. https://doi.org/10.1038/s44284-026-00494-0

Image Credits: AI Generated

DOI: 10.1038/s44284-026-00494-0

Keywords: urban design, fear of crime, public spaces, gender-sensitive design, urban lighting, perceived safety, women's mobility, sightlines, placemaking, Nature Cities, urban planning, social surveillance