Delhi’s heat crisis and Measures to tackle it

Source: The post “Delhi’s heat crisis and Measures to tackle it” has been created, based on “What measures are needed to address Delhi’s heat crisis? | Explained” published in “The Hindu” on 11th May 2026.

UPSC Syllabus: GS Paper-3- Environment

Context: Delhi and the NCR are facing longer and more intense heatwaves due to rapid urbanisation, shrinking green cover, excessive concretisation, and rising air-conditioning use. These factors have intensified the Urban Heat Island effect, turning the city into a “heat trap”.

Reason why Delhi is retaining heat

1. Concrete, asphalt, steel, and glass absorb heat during the day and release it slowly at night, preventing cooling.
2. Roads, rooftops, and facades store heat, causing surface temperatures to rise to 50–60°C in dense areas.
3. Glass-heavy architecture in Gurgaon and Noida increases solar radiation indoors and raises dependence on air conditioning.
4. Vehicular activity on corridors such as NH-48 creates continuous heat hotspots through engines and exhaust emissions.
5. High-density construction and narrow streets restrict airflow and trap heat within the city.
6. Traditional cooling features such as courtyards, shaded pathways, and ventilation corridors have disappeared.
7. Loss of green cover, degraded wetlands, and destruction of Yamuna floodplains have weakened natural cooling through evapotranspiration.

How does cooling further increase warming:

1. Air conditioners release heat outdoors while cooling interiors, thereby increasing ambient temperatures by 1–2°C in dense neighbourhoods.
2. Rising temperatures increase cooling demand, creating a feedback loop of more energy use and more heat release.
3. Delhi’s peak electricity demand has crossed 8,000 MW during summers due to high cooling requirements.
4. Increasing cooling demand also raises pressure on power systems and increases the risk of outages during extreme heat events.

Economic and ecological impacts

Economic impacts

1. Excessive heat reduces industrial and warehouse efficiency because machinery functions within temperature limits.
2. Productivity declines by 2–3% for every degree rise above optimal temperature levels.
3. Heat-related disruptions increase delays, operational costs, and supply chain inefficiencies.
4. Storage conditions deteriorate during extreme heat, affecting logistics and trade.
5. Delhi faces annual economic losses worth nearly $100 billion due to declining heat-related productivity.

Ecological impacts

1. Shrinking green cover reduces natural cooling and increases urban temperatures.
2. Degraded wetlands and disappearing water bodies weaken ecological resilience.
3. Loss of Yamuna floodplains reduces moisture retention and heat regulation capacity.
4. Increased energy consumption raises emissions and worsens environmental degradation.

Measures needed to address the heat crisis

Structural and architectural measures

1. Buildings should adopt cool roofs, reflective coatings, and high-albedo materials to reduce heat absorption.
2. Passive cooling techniques such as shading, cross-ventilation, and insulation must be promoted.
3. Urban design should reintroduce courtyards, shaded pathways, and ventilation corridors.
4. Energy-efficient appliances and district cooling systems should be encouraged to reduce heat discharge.

Urban planning measures

1. Urban planning should preserve airflow through proper street orientation and ventilation corridors.
2. Expansion of urban forests, parks, wetlands, and water bodies is necessary for natural cooling.
3. Sustainable public transport and electric mobility should be promoted to reduce vehicular heat emissions.
4. Green and blue infrastructure should be treated as essential cooling systems in city planning.

Social protection measures

1. Affordable housing upgrades should be undertaken to improve thermal comfort for vulnerable groups.
2. Subsidised cooling facilities and community cooling centres should be developed during heatwaves.
3. Public awareness and heat action plans should be strengthened to protect urban populations.

Conclusion: Delhi’s heat crisis is not only a climatic issue but also a structural and planning failure. A combination of climate-sensitive urban planning, sustainable infrastructure, ecological restoration, and social protection measures is essential to make the city resilient against extreme heat.

Question: What structural and urban planning measures are required to address Delhi’s growing heat crisis? Discuss the economic and ecological impacts of urban heat accumulation.

Source: The Hindu