UPSC Notes

Urban Heat Island Effect

PYQs

8

Articles

2

Momentum

26

Phase IFoundation

Background

Overview

Crucial for understanding urban planning challenges, sustainable development, climate change adaptation in cities, public health, and environmental management in rapidly urbanizing India.

The Urban Heat Island (UHI) effect describes the phenomenon where urban areas experience significantly higher temperatures than surrounding rural areas, primarily due to human activities, dense construction, and the prevalence of heat-absorbing surfaces like concrete and asphalt.

Phase IIStatic core

Facts & tables

Key facts

Causes

Dense building structures, dark impervious surfaces (roads, roofs), reduced vegetation cover, and anthropogenic heat generation from vehicles and industries.

Impacts

Exacerbates heat stress during heatwaves, increases energy consumption for cooling, and can worsen air quality.

Manifestation

Hyderabad, despite not always recording the highest regional temperatures, is identified as having a 'strong urban heat island' effect.

Mitigation

Strategies include increasing green spaces, using cool roofs and pavements, and implementing sustainable urban planning.

Temperature Differential

Urban areas can be 2°C to 10°C hotter than surrounding rural areas.

Consequences

Contributes to increased energy consumption for cooling and worsened air quality.

Exacerbation

Exacerbates the impact of global warming in urban settings.

Reference table

Static syllabus anchors

TypeReference
Conceptual areaUrban Planning
Conceptual areaClimate Change Adaptation
Conceptual areaEnvironmental Geography
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Statement-based questions

Prelims angle: Conceptual understanding

Quick revision

  • Urban areas are warmer than surrounding rural areas.
  • Caused by concrete, asphalt, lack of green cover, anthropogenic heat.
  • Increases heat stress and energy demand in cities.
  • Mitigation involves green infrastructure, cool surfaces.
  • A key challenge in urban climate resilience.

High-confidence PYQs

Topic timeline

Urban PlanningClimate Change AdaptationEnvironmental Geography

A heat crisis in Telangana that burns beyond the thermometer

29 May 2026 · The Urban Heat Island effect makes cities significantly hotter than rural areas due to urban infrastructure, intensifying heat stress and requiring specific mitigation in urban planning.

Read article

Concrete fever: On India and heat management

30 May 2026 · The Urban Heat Island effect causes cities to be significantly hotter than rural areas due to urban infrastructure and activities, intensifying heat stress and demanding climate-resilient urban design.

Read article

Related topics

Practice writing on this topic

UPSC has asked 8 linked questions on Urban Heat Island Effect in Mains. Write an answer to one — and get it evaluated.