Search Results (114)

Rapid unplanned urbanization is a common phenomenon in developing countries and the necessity for making an urban area sustainable and livable is one of the major challenges of today’s world. While the timely identification of the factors contributing to rapid unplanned urbanization is essential, uncovering the core reasons behind this phenomenon remains one of the most challenging tasks. The Night Light Development Index (NLDI) can track and monitor urbanization over time and can be used for understanding and optimizing the use of urban space at night due to its timely availability and accessibility. Previous research has only been conducted using VIIRS or DMP OLS satellite imagery to calculate the NLDI. However, the temporal and spatial resolution of these types of imagery are quite poor and require a lot of preprocessing. In this research, these complexities are addressed by introducing a modified NLDI, leveraging high-resolution nighttime imagery from NASA’s Black Marble product suite and population data from NASA’s Socioeconomic Data and Applications Center (SEDAC). This study examines the core drivers of unplanned urbanization in Dhaka by analyzing changes in regional inequality, electrification patterns, and GDP in relation to nighttime light, amidst the significant challenges posed by rapid urbanization in developing countries. The results indicate significant transformations in Dhaka’s urban land cover change (ULCC), with substantial increases in built-up areas correlating with heightened electrification and economic activity/GDP, as evidenced by NTL radiance patterns. Furthermore, the modified NLDI effectively captures the nuances of urban development and inequality, offering insights into regional disparities and urban planning challenges. We find that the income inequality or the NLDI value is the highest in the Biman Bandar area (0.910), followed by Pallabi (0.665), Turag (0.640), and Khilkhet (0.587). These values indicate significant income disparity between affluent and impoverished populations within these regions. Full article

South Asia, a rapidly urbanizing and industrializing region, faces critical air quality challenges, with transportation emissions becoming a major source of urban pollution. These emissions contribute significantly to public health issues, including respiratory and cardiovascular diseases, while imposing substantial economic burdens on affected populations. This study aims to examine regional trends, evaluate the economic impact of transportation-driven air pollution, and offer actionable insights for policy development. Using a narrative review approach, the study synthesizes evidence on air quality, transportation emissions, and public health in major South Asian cities. Key findings reveal that in Sri Lanka, transportation emissions, driven by traffic congestion and industrial activity, worsen respiratory conditions, especially in Colombo. In India, cities like Delhi suffer from severe health risks linked to pollution from the growing transportation sector. Pakistan’s expanding transportation sector increases energy consumption and emissions, particularly in Lahore, which experiences significant health impacts. In Bangladesh, Dhaka faces intense pollution due to urbanization and vehicle growth, while Kathmandu in Nepal struggles with diesel vehicle emissions. The economic burden of transportation-driven air pollution is considerable, with rising healthcare costs and productivity losses in major cities. The study recommends cleaner transportation technologies, enhanced public transit, and regional cooperation to address pollution, urging a comprehensive approach to urban planning and sustainable transport infrastructure for improved air quality and economic resilience in South Asia’s cities. Full article

This study investigates the viability of incorporating bicycles into the Dhaka Metro system, a groundbreaking urban transit project for Bangladesh. As Dhaka’s inaugural metro rail network, the system signifies a substantial advancement in addressing urban congestion and enhancing transportation alternatives in one of the world’s most densely populated cities. The current design of the metro fails to accommodate bicycles, hindering efficient first- and last-mile connectivity. The investigation utilized data from 382 fully completed questionnaires, obtained through purposive sampling, about metro–cycle integration in Dhaka. The research employed RIDIT and TOPSIS analyses to rank the characteristics deemed most essential for bicycle–metro integration according to user opinions. Research indicates that secure bicycle parking, multi-modal ticketing, route comfort, and safety measures are the foremost objectives for commuters. The high emphasis on secure parking indicates the need for safe and accessible storage options that would make cycling a viable mode for reaching metro stations. A multi-modal ticketing system further enhances convenience, providing seamless transitions between transit modes. Journey comfort and the need to mitigate risks posed by motorized vehicles underscore the importance of safe and user-friendly commuting environments. While features like road and station design were ranked lower in priority, the study emphasizes that a well-integrated bicycle infrastructure is essential to ensure the metro system’s success. With these improvements, Dhaka’s metro system can meet the growing demands for sustainable and inclusive urban mobility, setting a precedent for future infrastructure projects in Bangladesh. Full article

Public spaces are vital for urban living, contributing to the environmental, social, and economic aspects of city life. Hatirjheel Lakefront, a newly developed recreational area in Dhaka, offers significant potential for enhancing accessibility and connectivity in a rapidly urbanizing metropolis. This study aims to evaluate global and local integration of access routes and propose strategies to improve pedestrian and vehicular connectivity using Space Syntax methodology and DepthmapX V10 software. The key findings indicate that while Hatirjheel demonstrates strong global integration, regional integration remains moderate, with certain access roads being underutilized due to poor connectivity. Recommendations include enhancing integration through connecting dead-end roads, improving pedestrian pathways, and constructing foot-over bridges to mitigate vehicular traffic barriers. This study contributes to urban planning by providing actionable insights to optimize accessibility in public spaces, supporting recreational and economic activities. The findings are critical for creating a more integrated urban fabric in Dhaka, ensuring sustainable urban growth. This research provides actionable strategies for urban planners to optimize the use of public spaces, reinforcing the role of Hatirjheel as a vital component of Dhaka’s urban network. Full article

This study investigates the temporal and spatial variations in PM_2.5 concentrations in Dhaka, Bangladesh, from 2001 to 2023 and evaluates the impact of meteorological factors and the effectiveness of mitigation strategies on air pollution. Using satellite and ground-based data, this study analyzed the seasonal trends, daily fluctuations, and the influence of COVID-19 lockdown measures on air quality. Our findings reveal a persistent increase in PM_2.5 levels, particularly during winter, with concentrations frequently exceeding WHO guidelines. Our analysis suggests significant correlations between meteorological conditions and PM_2.5 concentration, highlighting the significant role of meteorological conditions, such as rainfall, humidity, and temperature, in modulating PM_2.5 levels. Our analysis found that PM_2.5 levels exhibited a significant inverse correlation with relative humidity (r = −0.72), rainfall (r = −0.69), and temperatures (r = −0.79), highlighting the role of meteorological conditions in mitigating pollution levels. Additionally, the study underscores the temporary improvements in air quality during lockdown periods, demonstrating the potential benefits of sustained emission control measures. The research emphasizes the need for comprehensive and multi-faceted air quality management strategies, including stringent vehicular and industrial emissions regulations, enhancement of urban green spaces, and public awareness campaigns to mitigate the adverse health impacts of PM_2.5 pollution in Dhaka. Full article

Rapid urbanization in South Asian cities has triggered significant changes in land use and land cover (LULC), degrading natural biophysical components and intensifying urban heat islands (UHIs). This study investigated the impact of LULC changes on land surface temperature (LST) and the role of biophysical indicators in enhancing urban resilience to thermal extremes. We used Landsat satellite imageries from 1993 to 2023, conducted a comprehensive analysis of LULC changes, and estimated LST variations at 6-year intervals in the Dhaka, Gazipur, and Narayanganj districts in Bangladesh. Afterward, we performed statistical analysis upon employing correlation, regression, and principal component analysis (PCA) techniques to summarize information. The results reveal that 339.13 km² worth of urban expansion has occurred in last 30 years, with an average annual growth rate of 3.5%, accompanied by a substantial reduction in water bodies (−139.17 km²) and vegetation cover. Consequently, summer temperatures exceeded approximately 36.52 °C in dense urban areas. Also, the results highlighted the strong influence of built-up areas (BSI and SAVI) on LST, while vegetation (NDVI) and water indices (NDWI) exhibited a negative association. The findings emphasize the urgency of integrating green infrastructure and deploying sustainable urban planning policies to mitigate the potential adverse impacts of scattered urbanization in the face of climate change. Full article

Green spaces play a critical role in enhancing the urban environment, improving livability, and providing essential ecosystem services. A city should have at least 25% green space from an environmental and health point of view. However, quantitative estimation is required to assess the extent and pattern of green space changes for proper urban management. The present study aimed to identify and track the changes in urban green spaces within the Dhaka South City Corporation (DSCC) of Bangladesh over a 30-year period (i.e., 1991–2021). Geospatial techniques were utilized to analyze green space dynamics using Landsat 4–5 TM satellite images from 1991, 2001, and 2011 and Landsat 8 images from 2021. Supervised image classification techniques and Normalized Difference Vegetation Index (NDVI) analysis were performed to assess the urban green space dynamics in DSCC. The results of our study revealed a significant 36.5% reduction in vegetation cover in the DSCC area over the study period. In 1991, the green area coverage in DSCC was 46%, indicating a relatively healthy environment. By 2001, this coverage had declined sharply to 21.3%, further decreasing to 19.7% in 2011, and reaching a low of just 9.5% in 2021. The classified maps generated in the study were validated through field observations and Google Earth images. The outcomes of our study will be helpful for policymakers and city planners in developing and applying appropriate policies and plans to preserve and improve urban green spaces in DSCC in Bangladesh and other Asian megacities with high population density. Full article

The global challenge of air pollution’s adverse health effects, particularly highlighted in Dhaka, Bangladesh, underscores the significant impact of particulate matter (PM) exposure. This study aims to assess the current sources of PM_2.5 emissions in different microenvironments around Dhaka and explore potential risk factors to assess individual 24 h exposure to PM_2.5. A commercially available low-cost sensor was utilized for collecting data for 15 days under various environmental conditions. The average concentrations for PM_1.0, PM_2.5, and PM₁₀ were 37.05 ± 24.36 µg/m³, 57.22 ± 40.75 µg/m³, and 69.22 ± 48.46 µg/m³, respectively. The highest PM_2.5 concentrations were found (78.87 ± 53.69 μg/m³) in restaurants and residences (62.35 ± 41.70 μg/m³), while air-conditioned shopping malls exhibited the lowest concentrations (20.08 ± 15.57 μg/m³). Driving with windows closed and utilizing air conditioning resulted in a 33–52% reduction in PM_2.5 concentrations inside the car. The Hazard Quotient (HQ) for PM_2.5 varied by location, with a low level observed in the air-conditioned locations and a moderate level observed in restaurants and non-air-conditioned shopping malls. The significance of this study lies in its potential to inform public health strategies and urban planning initiatives aimed at reducing air pollution exposure in highly populated cities like Dhaka. Full article

Although Bangladesh is a constitutionally Islamic country, some brothels are regulated by state law. But these brothels are located in the suburbs, and there were legal brothels around the capital, which no longer exist. Thus, prostitution is observed in a variety of ways, including in residential hotels, resorts, homes, and open spaces. As prostitution and trafficking are inseparable, this paper adopts a quantitative approach to measure the socioeconomic variables associated with prostitution and trafficking in children in the capital city of Dhaka, Bangladesh. The data for this study were collected from 385 respondents, and the questionnaire format was open-ended. The proposed conceptual model is presented in a way that includes sociocultural and economic factors influencing prostitution. To examine the model, a three-level research design was applied. The sociodemographic data of the respondents were collected and analyzed in this study. This study finds that the significant economic factors are poverty and lack of employment opportunities. Moreover, sociocultural variables are closely associated with rape, harassment, divorce, insufficient support from household members, living in vulnerable conditions, social instability, lifestyle, and gender violence. These findings emphasize the need to implement existing anti-trafficking laws and raise awareness of children in Bangladesh to stop child trafficking for sex work. Full article

Businesses use technological and social media marketing to respond to the COVID-19 pandemic. The study aims to better understand the factors that impact the spread of new technologies, the effectiveness of social media advertising, and the longevity of businesses. The researcher used a quantitative strategy based on partial least squares structural equation modeling to learn about the phenomenon of interest as much as possible. Dhaka, Bangladesh, small and medium enterprises (SMEs) participated in the survey. According to the findings, the popularity of internet and e-business technologies may be attributed to their apparent usefulness and practical experience ease of use. It is connecting internet/e-business technology, social media marketing, and the long-term success of small and medium enterprises (SMEs). Still, the expense factor was insufficient to prove that SMEs engage in social media advertising. The mediating effects between components may be better understood via internet/e-business technology and social media interactions, as shown in the study. This study is the first of its kind in Bangladesh and sheds light on the resilience of SMEs in the face of the COVID-19 pandemic, notwithstanding its focus on the capital city of Dhaka. Full article

In response to global urbanization and economic development, urban surface water pollution has become a universal challenge and particularly affects densely populated megacities, and Dhaka is no exception. The discharge of 98% of untreated domestic sewage and massive volumes of industrial wastewater from over 7000 industries escalate surface water crises. This study investigates microbial and fecal contamination with particular emphasis on Cryptosporidium in surface water, known for causing waterborne diseases, such as cryptosporidiosis. Findings reveal high Cryptosporidium oocyst concentrations and fecal contamination in various water bodies in Dhaka City. Among the investigated water bodies, the Buriganga River exhibits the highest Cryptosporidium oocyst concentration (46%), while the Balu River, Turag River, Shitalakkhya River, Dhanmondi Lake, Gulshan Lake, Banani Lake, Ramna Lake, and Crescent Lake also present high levels of oocyst concentrations ranging from 21–40%. This study also calculated infection risks and found that the infection risk of swimming is highest during the wet season and is (3.9 ± 2.2 (95% CI: 3.0–5.0)) × 10⁻² per swimming event, whereas it is approximately (2.4 ± 1.9 (95% CI: 1.6–3.3)) × 10⁻² during the dry season. Annual diving risks are approximately (1.2 ± 0.6 (95% CI: 0.9–1.4)) × 10⁻², indicating considerably high risks. Most of the sampling sites generally show significantly higher risks than other study areas like the Mymensingh and Kushtia Districts. In light of these results, we strongly recommend immediate measures to address water quality issues and mitigate the risks associated with Cryptosporidium contamination in Dhaka’s surface water. Full article

Urban flooding is a frequent disaster during the monsoon period (June–October), hindering the daily lives of city dwellers, especially slum dwellers in Dhaka, Bangladesh. This study assessed the impact of urban flooding on the lives of Baganbari slum dwellers in Dhaka, Bangladesh using Moser analytical tools to explore how urban flooding affects individuals of different genders. Participatory and survey methods involving 50 slum dwellers (25 men, 25 women) were carried out to collect feedback and comments. Additionally, focus group discussions (FGDs) and semi-structured and key informant interviews (KII) were also conducted to express gender-related discrimination (e.g., men vs. women). Women are usually involved in “double day” roles (100% in reproductive and 72% in productive roles) while 92% of men are found to have no contribution in those roles. Moreover, women’s participation in community roles is significantly affected during urban flooding (almost 100%) as it imposes a compulsion for them to stay home and carry out their reproductive work. Thus, women encounter numerous challenges in meeting their practical and strategic needs, including ensuring food supplies, managing diseases and menstrual health, upholding sanitation, restricted movement, education obstacles, and more. The result shows that women in the Baganbari slum are found to have only 35% access and 6% control over resources, benefits, health facilities, and decision-making power during urban flooding. The significant decline in the access and control profile of women during urban flooding aggregates their difficulties and drives them into vulnerable positions in their own households. Full article

This qualitative study aimed to explore the different ways of spouse support for garment workers in Dhaka city. Data were collected through in-depth interviews with male and female workers and their spouses and key informant interviews with relevant stakeholders to explore the different ways of support. The results highlight that male and female workers receive different ways of support for their ways in workplace resistance; therefore, male and female workers cannot participate in their workplace resistance in the same way. In terms of large collective resistance activities, husbands and wives support their spouses’ decisions to participate. Such agreement is important for workers to receive financial and other supports during the protest. However, not all female workers can participate inside and outside large groups of collective resistance as can male workers. Some female workers need to convince their husbands in order to participate inside and outside large groups of collective resistance, because husbands are serious about adherence to purdah. Such restrictions from husbands make it difficult for female workers who are in a dilemma between pressure from coworkers and from their husbands. In terms of small groups of collective resistance and individual resistance, women are more engaged than men, since men, being the main breadwinner in the family, cannot risk their jobs through such resistance. Full article

The alteration of the Earth’s surface due to urbanization and the formation of urban heat islands is one of the most evident and widely discussed anthropogenic impacts on Earth’s microclimate. The elevated land surface temperature in the urban perimeter compared with the surrounding non-urban area is known as the surface urban heat island (SUHI) effect. India has experienced swift urban growth over the past few decades, and this trend is expected to persist in years to come. The literature published on SUHI in India focuses only on a few specific cities, and there is limited understanding of its geospatial variation across a broader region and its long-term trend. Here, we present one of the first studies exploring the long-term diurnal (daytime, and nighttime), seasonal, and annual characteristics of SUHI in the 20 largest urban centers of India and its neighboring countries. The study highlights a statistically significant (95% confidence interval) rise in nighttime surface temperatures across major cities based on a linear fit over 23 years (2000–2023) of MODIS land surface temperature satellite observations. The nighttime SUHI was found to be more conspicuous, positive, and consistent when compared with daytime satellite observations. The nighttime SUHI for April–May–June representing the pre-monsoon and onset of monsoon months for the top 10 cities, ranged from 0.92 to 2.33 °C; for December–January–February, representing the winter season, it ranged from 1.38 to 2.63 °C. In general, the total change in the nighttime SUHI based on linear fit (2000–2023) for the top ten cities showed warming over the urban region ranging from 2.04 to 3.7 °C. The highest warming trend was observed during the months of May–June–July (3.7 and 3.01 °C) in Ahmedabad and Delhi, cities that have undergone rapid urbanization in the last two to three decades. The study identified strongly positive annual SUHI intensity during nighttime, and weakly negative to moderately positive annual SUHI intensity during daytime, for major cities. Jaipur (India), Lahore (Pakistan), Dhaka (Bangladesh), and Colombo (Sri Lanka) showed a nighttime SUHI intensity of 2.17, 2.33, 0.32, and 0.21 °C, respectively, during the months of April–May–June, and a nighttime SUHI intensity of 2.63, 1.68, 0.94, 0.33 °C, respectively, for the months of December–January–February (2000–2023). It is apparent that the geographical location (inland/coastal) of the city has a high influence on the daytime and nighttime SUHI patterns. The current research is intended to help city planners and policymakers better understand SUHI intensity (day and night/seasonal basis) for developing strategies to mitigate urban heat island effects. Full article

Determining the mode choice for movement in developing cities like Dhaka is beset with multifaceted challenges and intricacies, rendering it an arduous undertaking. Numerous factors contribute to the complexity, thereby impeding the selection of an optimal transportation mode. Bangladesh University of Engineering and Technology (BUET) attracts students from various regions and cultures in Dhaka city. Examining users’ perceptions of preferred mode choice is the primary objective of this study. Transportation performance of buses and institutional buses was considered as most of the off-campus students are highly dependent on these two modes. Structural equation modeling (SEM) was implemented to create two distinct empirical models to investigate the correlations between key factors that impact public transportation mode choice. Models were calibrated using data from 1664 respondents who were formally surveyed about their expectations, experiences, and opinions regarding their usual means of transportation. There were 20 attributes of travel experience including safety, comfort, cost, travel time, waiting time, convenience, reliability, availability, environment friendliness, driver behavior, overtaking tendency, vehicle speed, obeying the law, accident probability, weather, punctuality of arrival and departure, etc. Policy implications have been analyzed in the context of a developing country such as Bangladesh from the perceived ratings on mode choice so that by providing reliable, efficient, and student-friendly transportation options, educational institutions, planners, and transportation authorities can support the success and overall well-being of off-campus students. Full article