Peenya, Hennur among pockets emerging as heat islands; GBA plans cooling measures
Urban heat islands occur when dense construction, asphalt roads, and reduced greenery trap heat during the day and release it at night, making these areas hotter than their surroundings
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Context
A recent baseline study has identified several industrial and residential areas in Bengaluru, such as Peenya and Hennur, as emerging 'urban heat islands' (UHIs). These areas record temperatures up to 4 degrees Celsius higher than their surroundings. This phenomenon occurs when dense construction and reduced green cover trap heat, posing significant environmental and social challenges. In response, the Greater Bengaluru Authority (GBA) is reportedly planning cooling interventions.
UPSC Perspectives
Environmental & Geographical
The emergence of Urban Heat Islands (UHI) in Bengaluru is a classic example of human-environment interaction driven by rapid urbanization. Geographically, a UHI is a metropolitan area significantly warmer than its surrounding rural areas. This occurs because urban materials like concrete and asphalt have a low albedo (reflectivity) and high thermal capacity, meaning they absorb and retain more solar radiation than natural landscapes. The lack of vegetation reduces evapotranspiration, a natural cooling process. In Bengaluru, this is evident in industrial zones like Peenya, which have minimal tree cover and a high density of heat-absorbing surfaces. This phenomenon alters local weather patterns, increases air pollution by trapping pollutants, and puts a strain on water resources due to increased evaporation. For the UPSC exam, this topic is crucial for understanding the environmental consequences of unplanned urban growth and its link to climate change.
Governance & Policy
The issue of urban heat islands necessitates a multi-pronged governance approach. At the national level, the India Cooling Action Plan (ICAP) provides a framework for sustainable cooling and reducing cooling demand by 20-25% by 2037-38. However, its implementation rests on state and local bodies. As heatwaves are now recognized as a disaster, the has issued guidelines for Heat Action Plans (HAPs). The empowers Urban Local Bodies (ULBs) with functions listed in the 12th Schedule, including urban forestry and environmental protection, making them the key implementing agencies for mitigation. The response of the Greater Bengaluru Authority (GBA) to create cooling measures exemplifies this local action. Challenges for ULBs include funding, inter-departmental coordination, and enforcing regulations like green building codes. UPSC aspirants should analyze the effectiveness of such top-down policies and the role of decentralized governance in climate adaptation.
Social & Economic
The social and economic impacts of urban heat islands are disproportionately borne by vulnerable populations. In Bengaluru's heat hotspots, outdoor workers, such as traffic police and daily wage laborers, face prolonged heat exposure, leading to reduced productivity and heat-related illnesses like heatstroke. The increased ambient temperature raises the demand for air conditioning, leading to higher energy consumption and costs for households and businesses. This strains the electricity grid and increases greenhouse gas emissions, creating a vicious cycle. Marginalized communities residing in densely packed, low-quality housing with poor ventilation are particularly at risk. Addressing this requires not just environmental solutions but social safety nets and targeted public health interventions, as outlined in frameworks by bodies like the . Understanding these socio-economic dimensions is vital for questions on inclusive development and the human geography of urban areas.