Dhaka’s slums house millions of people in some of the most densely packed urban conditions on earth. Roughly 30 percent of the city’s population lives in informal settlements marked by insecure land tenure, overcrowded housing, and limited access to basic services like clean water and sanitation. These communities are not static or uniform: they are shaped by climate displacement from rural Bangladesh, sustained by low-wage labor that powers the country’s economy, and burdened by overlapping health and environmental hazards that compound one another in ways outsiders rarely appreciate.
Why So Many People End Up in Dhaka’s Slums
Bangladesh faces some of the most severe climate pressures of any country. Rising temperatures, unpredictable rainfall, intensifying floods, and cyclones have eroded agricultural livelihoods across rural areas, pushing huge numbers of people toward the capital. Many of these climate-displaced individuals settle in Dhaka’s slums because they are the only affordable option in a city where formal housing is far out of reach.1Growth and Change. Climate Migration and Urban Vulnerability: Livelihood and Health Implications in Dhaka’s Slum Settlements The scale of this displacement is staggering: natural disasters in Bangladesh create hundreds of thousands of climate migrants every year, driven by sudden events like cyclones and river erosion as well as slower-moving threats like sea-level rise and soil salinization. Some projections suggest that more than 35 million people in coastal Bangladesh will face displacement risk by 2050.2Environmental Challenges. Climate change and migration impacts on cities: Lessons from Bangladesh
This migration is not a new phenomenon, but the pace is accelerating. Dhaka already struggles to provide infrastructure for its existing residents, and the steady influx of climate migrants means slum populations continue to grow faster than the city’s ability to absorb them. People arrive seeking any kind of work, and many end up in garment manufacturing, rickshaw-pulling, domestic service, or informal street vending. A significant proportion of garment workers, particularly women, live in crowded low-income neighborhoods near factories.3The Millennium University. An Analysis of Socio-Economic Condition of Female Readymade Garments’ (RMG) Workers in Dhaka City
Housing That Makes Everything Worse
Most slum dwellings in Dhaka are built from corrugated tin sheets, bamboo, and whatever materials residents can afford. The problem with tin is not just that it is flimsy; it becomes dangerously hot. Under direct sunlight and heat exposure, tin roofing can reach around 75°C (167°F), and indoor temperatures in these dwellings often exceed outdoor temperatures and stay elevated well into the night.4Sustainable Cities and Society. Rising temperatures, rising vulnerabilities: Individual and community adaptation to heat stress in urban slums of Bangladesh A recent study measuring temperatures inside Dhaka slum housing found that all-tin dwellings experienced the widest indoor temperature swings, ranging from 19°C to over 47°C, and logged far more hours above 35°C than homes built with cement.5PubMed Central. Impact of Housing Construction Materials on Indoor Temperatures in Urban Slums of Dhaka, Bangladesh For families who cannot afford air conditioning or even electric fans, this means living through Bangladesh’s summer months in what is essentially an oven.
Tenure insecurity makes the housing problem even harder to solve. Slum residents typically do not own the land they live on and face the constant threat of eviction. Bangladesh has a long history of forced slum clearances: a single mass eviction in 1975 displaced roughly 173,000 people, and large-scale removals have continued periodically in the decades since, each time uprooting thousands of families.6Elsevier. Bastee eviction and housing rights: a case of Dhaka, Bangladesh When you might be bulldozed at any time, there is little incentive to invest in sturdier or safer construction, so the cycle of flimsy housing and vulnerability persists. Local power brokers and ganglords often control access to services in these settlements and charge exploitative rates for electricity, water, and even the right to remain.7Elsevier / Procedia Economics and Finance. Factors in building resilience in urban slums of Dhaka, Bangladesh
Water, Sanitation, and the Fecal Contamination Problem
Inadequate sanitation is one of the most serious and least visible crises in Dhaka’s slums. A comprehensive assessment of fecal contamination across urban Dhaka found extensive E. coli in most environmental samples collected across ten different neighborhoods. The researchers estimated that 98 to 99 percent of all fecal waste in Dhaka is ultimately released into the urban environment, including residential areas, regardless of geographic location or socioeconomic status.8PubMed Central. Quantitative assessment of fecal contamination in multiple environmental sample types in urban communities in Dhaka, Bangladesh using SaniPath microbial approach In slums, where shared latrines are overcrowded and drainage systems barely exist, the exposure is far worse.
This contamination feeds directly into disease. Cholera has long been endemic in Dhaka, and slum dwelling itself is a risk factor. Research comparing cholera patterns across two decades found that while overall cholera rates dropped between the 1990s and the 2010s, slum residents in the later period faced significantly higher odds of infection, even after adjusting for income, age, and other factors. Strikingly, drinking tap water, which had been protective in the 1990s, was associated with higher cholera risk in the more recent period, suggesting degradation of the piped water system over time.9PubMed Central. Changing Water-Sanitation Determinants of Cholera over Two Decades in Bangladesh Cholera risk in Dhaka is also modulated by climate variability, particularly the El Niño Southern Oscillation, with the densely populated urban core being especially sensitive and transmitting risk outward to the city’s periphery.10Advances in Water Resources. Climate-driven endemic cholera is modulated by human mobility in a megacity
Dengue and Other Vector-Borne Diseases
Cholera is not the only disease amplified by slum conditions. Dengue fever, spread by Aedes mosquitoes, is a growing threat across Dhaka, and low-income areas bear a disproportionate burden. Studies have found that mosquito presence is significantly higher in lower socioeconomic zones of the city, where stagnant water collects in discarded containers, open drains, and water-storage vessels.11PLoS ONE. Risk factors for the presence of dengue vector mosquitoes, and determinants of their prevalence and larval site selection in Dhaka, Bangladesh The factors that drive mosquito breeding, such as household water storage systems, shaded outdoor areas, and the presence of vegetation, are all common features of slum environments where piped water is unreliable and residents keep water in any available container.12Tropical Medicine and Health. Identification of Essential Containers for Aedes Larval Breeding to Control Dengue in Dhaka, Bangladesh Climate variables like rainfall, temperature, and humidity further affect mosquito abundance, making dengue a seasonal hazard that hits hardest during and after the monsoon.
Children Pay the Highest Price
Malnutrition among children in Dhaka’s slums is alarmingly common. One assessment found that 63 percent of children were malnourished and 58 percent were stunted, meaning their growth had been permanently impaired by chronic undernutrition.13PubMed Central. Growth, environment and hygiene in the slums of Bangladesh: a situation assessment for scaling up aH2 intervention A separate survey focusing on children aged two to twelve in Dhaka slums reported that about a third were suffering from malnutrition and a similar share were underweight by body mass index.14Journal of Nutrition & Food Sciences. Nutritional Status of Children in Slums of Dhaka, Bangladesh The variation between studies reflects differences in age groups and methods, but the overall picture is consistent: a large share of slum children are not getting enough food, and the consequences for their physical and cognitive development are severe and often irreversible.
Child labor compounds the problem. Research on Dhaka’s slum settlements found a destructive cycle between child labor and educational disadvantage. Children enter the labor market for complex and intertwined reasons, and their earnings, however small, lift household income enough that families become dependent on them. This makes it even harder for children to stay in school, trapping them in low-skill work with little prospect of breaking out of poverty.15World Development Perspectives. Child labour and education – A survey of slum settlements in Dhaka (Bangladesh)
Mental Health Under Extreme Pressure
The psychological toll of slum life is enormous and underappreciated. A cross-sectional study of adults in Bangladeshi slums found that about 55 percent reported significant stress, 63 percent experienced anxiety, and 73 percent showed signs of depression. Food insecurity was a powerful driver: people experiencing moderate to severe food insecurity had roughly eight times the odds of anxiety and nearly three times the odds of depression compared to those with adequate food access.16PubMed Central. Household food security and its influence on psychological well-being: a cross-sectional study among adults in slums in Bangladesh
The physical environment itself also matters for mental well-being. A geoepidemiological study of mental health in Dhaka’s slums found that factors like flood risk, sanitation quality, housing conditions, and even features of the natural environment were significantly associated with mental well-being.17PubMed Central. Mental health in the slums of Dhaka – a geoepidemiological study In other words, mental health in these settings is not simply about individual resilience or personal circumstances. It is shaped by the same structural failures, contaminated water, cramped housing, chronic flooding, that drive physical illness.
Healthcare Access and the Informal Drug Market
When slum residents get sick, reaching competent medical care is a challenge in itself. Formal healthcare facilities are often physically distant from informal settlements, and even when residents can get there, the cost of a diagnostic test or medicine can be prohibitive. A qualitative study of healthcare access in Dhaka’s informal settlements found that local unlicensed pharmacies and traditional birth attendants are often the most prominent providers, but they frequently over-prescribe medications and lack adequate training.18PubMed Central. Healthcare in the Margins: A Qualitative Study of Healthcare Access and Utilization in Bangladesh’s Informal Urban Settlements
One alarming consequence is the unregulated dispensing of antibiotics. The geographic distance from formal care normalizes reliance on informal drug sellers who hand out antibiotics without prescriptions or proper diagnosis, directly fueling antimicrobial resistance.19BMJ Open. What is the benefit of visiting a doctor, if we cannot afford a diagnostic test or buy medicine? An exploratory study of equity in antimicrobial resistance among the urban informal settlements of Dhaka This is not just a local problem: antimicrobial resistance bred in densely populated areas with high antibiotic misuse can spread through travel, trade, and water systems. Maternal health follows a similar pattern. An analysis of neonatal and maternal deaths in Dhaka slums concluded that maternal mortality will not decrease without access to facilities that provide basic emergency obstetric care and timely referral systems, services that remain scarce in informal settlements.20PubMed Central. Causes of neonatal and maternal deaths in Dhaka slums: implications for service delivery
Fire Risk and Disaster Vulnerability
Fire is one of the most feared hazards in Dhaka’s slums. The same flammable construction materials that make homes unbearably hot also make them extremely prone to burning. Unsafe electrical connections, often jerry-rigged by residents or intermediaries tapping into the grid illegally, are a common ignition source. Narrow lanes between dwellings prevent fire trucks from reaching affected areas, and there is almost no firefighting infrastructure within settlements themselves.21International Journal of Disaster Risk Reduction. Household-Level Assessment of Urban Fire Risk in Dhaka, Bangladesh A study of Korail, one of Dhaka’s largest slums, identified the combination of flammable building materials, faulty wiring, and lack of fire-prevention equipment as the core drivers of fire vulnerability among the urban poor.22The Jahangirnagar Review: Part II. Planning approach to reduce fire risk of urban poor: A case study in Korail slum of Dhaka Bangladesh
When a fire breaks out, it can consume hundreds of homes in minutes. Residents lose everything, including the materials they used to build the home in the first place, and they have no insurance or safety net to fall back on. The rebuilding cycle, if they are allowed to rebuild at all given their lack of land tenure, starts from scratch each time.
Women’s Safety and Sanitation
Women in Dhaka’s slums face a distinct set of dangers that are rarely visible in official statistics. The lack of private, accessible toilet facilities forces many women to use distant or poorly lit communal latrines, or to resort to open defecation, exposing them to harassment and violence. Research on women’s safety in slum sanitation found that sexual abuse is one of the leading crimes against women in these settings, driven in large part by the lack of toilet access and inadequate police response. Verbal violence is also common, particularly when women must wait in line for scarce water or use facilities in areas where men congregate. Insufficient lighting, dangerous toilet locations, and the cost of using public facilities all compound the risk.23Qeios. Women In Slum Risking Their Safety To Access And Usage Of Basic Water And Sanitation Facilities
What NGOs and Microfinance Have Actually Achieved
Non-governmental organizations have been active in Dhaka’s slums for decades, and they have made a measurable difference for some households. A study of NGO-supported slum communities found that about 44 percent of participants said NGO initiatives had improved their food and clothing situation, and about 22 percent reported a broader change in socioeconomic status after joining an NGO program.24Interdisciplinary Journal of Applied and Basic Subjects. Role of Non-government Organizations in Alleviating Poverty from Urban Slums: A Study in Bangladesh Community-driven housing initiatives have also shown promise: one project demonstrated that organized slum communities, with active NGO support, could develop their own housing, offering a potential model for affordable construction in a country where resources are extremely constrained.25Environment and Urbanization ASIA. Assisted Community Housing Initiative in Dhaka
Microfinance, often held up as a tool for poverty reduction, has had a more mixed record in Dhaka’s slums. Research found that urban microfinance had a statistically significant positive effect on some financial indicators like savings, spending on education, and transportation expenses, and borrowers were more likely to change occupations than non-borrowers. Microfinance also improved housing conditions and access to water and sanitation for participants. But the benefits did not extend across all income and expenditure categories, suggesting that microloans alone are not enough to lift families out of poverty when the surrounding infrastructure remains broken.26Journal of Urban Management. Impact of urban microfinance on the livelihood strategies of borrower slum dwellers in the Dhaka city, Bangladesh
The Scale That Defies Easy Solutions
What makes Dhaka’s slum crisis so resistant to improvement is the way its problems interconnect. Climate displacement pushes people into a city that cannot house them. Insecure tenure discourages investment in safer buildings. Tin-roof housing drives extreme heat exposure and fire risk. Inadequate sanitation contaminates the water system, which fuels cholera and other diarrheal diseases. Malnutrition weakens children’s ability to fight off infections. Poverty pulls children out of school and into work. Food insecurity drives depression and anxiety. And informal healthcare fills the gap left by absent formal services, but it does so with unregulated drug dispensing that creates entirely new public health threats like antimicrobial resistance.
No single intervention addresses all of these problems simultaneously, which is why piecemeal approaches, a latrine program here, a microfinance scheme there, produce real but limited results. The 35 million people projected to face displacement from coastal Bangladesh by 2050 will need to go somewhere, and without massive changes in housing policy, land rights, and urban infrastructure, Dhaka’s slums will continue to absorb people at a pace that outstrips every effort to improve conditions within them.27Environmental Challenges. Climate change and migration impacts on cities: Lessons from Bangladesh