Mitigating Urban Heat Island Effect in Megacities: The Case of Delhi and Bangalore, India

Urban Heat Island (UHI) is a rising environmental concern that has gathered increasing attention due to its profound impact on quality of life in megacities worldwide. This paper delves into the Urban Heat Island phenomenon in megacities like Bangalore and New Delhi, its root causes, resulting consequences as well as potential remedies. Furthermore, this study emphasizes the urgency of addressing UHIs in megacities through strategic urban planning. The paper aims to comprehend the adverse impacts of UHIs and investigate planning strategies to mitigate them, with a primary focus on urban characteristics such as urbanization, land use patterns, and green spaces as the main drivers of UHIs. Rapid urbanization transforms natural landscapes into areas dominated by heat-retaining materials such as concrete and asphalt, leading to higher temperatures that intensify the effect of Urban Heat Islands (UHIs). Densely built-up areas with towering buildings trap heat, while diminishing green spaces such as parks, gardens, and trees etc., lose their ability to provide cooling shade and evapotranspiration (the process by which plants release water vapor). This paper highlights the necessity of adaptive urban planning strategies tailored to the unique challenges of each megacity, aiming to create more sustainable and resilient urban environments. Additionally, the inclusion of green infrastructure, water bodies and sustainable urban development practices can also lead to an increase in the resilience and liveability of cities alongside the mitigation approach towards UHI effect.