From April 23 to 25, 2026 the IMD has warned that Delhi‑NCR will remain under heatwave conditions, with temperatures already hovering between 40 °C and 42 °C and likely to rise another 1‑2 °C for at least five days.

Key Developments

IMD has activated a colour‑coded heatwave alert (Green → No action, Yellow → Stay updated, Orange → Be prepared, Red → Take action).
Heatwave thresholds differ by geography: plain ≥40 °C, coastal ≥37 °C, hilly ≥30 °C.
A departure of 4.5 °C–6.4 °C from normal is a heatwave; >6.4 °C or two stations recording ≥45 °C for two consecutive days signals a severe heatwave.
The UHI effect adds 4‑15 extra warm nights in major Indian cities, aggravating health risks.
Existing HAPs are not covered under the NDRF/SDRF, and many lack local vulnerability assessments.
The ICAP aims for a 20‑year roadmap (2017‑38) to expand equitable cooling while curbing greenhouse gases.

Important Facts

~75 % of India’s workforce (≈380 million people) is engaged in heat‑exposed occupations (World Bank, 2022).
Heatwaves caused an estimated 24,223 deaths (1992‑2015) and 3,798 deaths (2018‑2022) (NDMA, NCRB).
Extra warm nights added per summer: Mumbai +15, Bengaluru +11, Bhopal +7, Jaipur +7, Delhi +6, Chennai +4 (CEEW).
Air‑conditioner penetration is under 10 % in India, versus >90 % in the US, highlighting future energy‑demand challenges.

UPSC Relevance

Understanding heatwave dynamics links directly to GS 3 (Environment & Economy) – climate change, disaster management, and energy security. The policy gaps in HAPs and their exclusion from NDMA‑funded schemes illustrate governance challenges (GS 2). The Kigali Amendment connection underscores India’s international climate commitments.

Way Forward

Classify heatwaves as a disaster under NDRF/SDRF.
Develop city‑specific heat‑vulnerability maps instead of uniform 40 °C thresholds.
Mandate green‑space quotas, green roofs and reflective pavements in urban planning to curb the UHI effect.
Accelerate ICAP milestones, especially the 10 % HFC reduction by 2032.
Strengthen public‑health components of HAPs: more cooling centres, targeted awareness for outdoor workers, elderly and children.

Addressing the early onset of heatwaves is essential for safeguarding health, sustaining productivity and meeting India’s climate‑adaptation goals.