Urban Heat Island (UHI) Effect
The Urban Heat Island effect refers to the phenomenon where urban areas record significantly higher temperatures than surrounding rural areas due to the concentration of built surfaces, reduced vegetation, waste heat from human activity, and altered surface albedo. Dark concrete and asphalt absorb solar radiation and re-emit it as heat; vegetation cools through evapotranspiration and shading. Delhi's urban core can be 7–10°C warmer than periurban areas; the effect is most pronounced at night when built surfaces continue radiating stored heat.
- Primary drivers: impervious surfaces (roads, buildings), low albedo materials, loss of vegetation and water bodies, anthropogenic heat from vehicles and air conditioning.
- Evapotranspiration from a single large tree can provide cooling equivalent to 10 room-sized air conditioners running 20 hours a day.
- India's National Mission on Sustainable Habitat (NMSH), one of eight missions under NAPCC (2008), addresses urban heat as part of climate-resilient urban planning.
- Urban Heat Islands worsen ground-level ozone formation, increase energy demand for cooling, and disproportionately affect outdoor workers, elderly, and low-income populations.
● Tracked since April 02, 2026 · last seen May 09, 2026 · updates as the daily brief publishes
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