Mentor’s Comment:  According to the World Meteorological Organization, 2024 was the hottest year ever recorded, with global temperatures about 1.55°C higher than in pre-industrial times. In India, December 2022 was the hottest December since temperature records began in 1901. Overall, India has seen more heatwaves in the last 20 years compared to the 20 years before that.

Today’s editorial talks about the current heatwave situation and its effects. This topic is useful for GS Paper 3 in the UPSC Mains exam.

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Let’s learn!

Why in the News?

On March 15, some states and cities in India faced their first severe heatwave of 2025 — about 20 days earlier than the first severe heatwave in 2024.

What are the key health and socio-economic effects of heatwaves in India?

• Health Impacts (Heat Stress): Heatwaves in India lead to heat stress, which occurs when the outside temperature approaches the body’s normal temperature of 37°C. This hampers the body’s ability to release internal heat, leading to a range of health problems including kidney failure, liver damage, and brain-related issues, sometimes resulting in death. Eg, the 2015 heatwave in Andhra Pradesh and Telangana caused over 2,000 deaths due to extreme temperatures.
• Impact on Agriculture and Livestock: Heatwaves negatively affect the farming sector, reducing crop yields and livestock production due to heat stress. Eg, the 2020 heatwaves led to significant crop damage, particularly in areas like Punjab and Haryana, where farmers saw a drop in wheat and paddy production, impacting food security.
• Socio-Economic Consequences: Heatwaves result in loss of productivity, particularly in labor-intensive sectors like agriculture, construction, and outdoor work. This causes economic losses as workers lose work hours, and agricultural outputs decline. Eg, in 2023, heat stress led to an estimated loss of 6% of work hours in India, contributing to reduced personal incomes and affecting national GDP.

Why is heat stress an equity issue for vulnerable groups?

• Disproportionate Impact on the Poor: Vulnerable groups such as the poor face the worst effects of heat stress due to limited access to resources like cooling systems, healthcare, and safe working conditions. Eg, in urban slums with poor infrastructure, people are exposed to higher temperatures both indoors and outdoors, leading to greater health risks compared to wealthier populations with air-conditioned homes.
• Gendered Impact: Women, especially in rural and lower-income areas, are more affected by heat stress due to cultural norms that restrict their mobility and tasks, such as working in kitchens or wearing heavy clothing. Eg, women in rural India may have to work in the kitchen during peak heat hours, further increasing their risk of heat-related illnesses.
• Impact on Migrant Workers and Informal Sector Employees: Migrants and workers in the informal sector often lack access to benefits such as paid leave, healthcare, or workplace protections, making them more vulnerable to heat stress. Eg, construction workers in cities like Delhi and Mumbai suffer from heat-related illnesses as they work outdoors without proper protection, and they cannot afford to miss work, leading to further health deterioration.

When did India begin implementing Heat Action Plans (HAPs), and how have they evolved over the years?

• Initial Implementation in 2013: India began implementing Heat Action Plans (HAPs) in 2013 when Ahmedabad, Gujarat, became the first city in Asia to develop a municipal Heat Action Plan. The plan focused on early heatwave predictions, public awareness, and health system preparedness. Eg, Ahmedabad’s HAP helped reduce heat-related mortality by alerting vulnerable communities and healthcare systems ahead of heatwaves.
• Expansion to Other Cities (2014-2018): After the success in Ahmedabad, other cities and states began developing their own heat action plans. By 2018, over 20 Indian cities and states had implemented their HAPs, adapting them based on local vulnerabilities. Eg, cities like Chennai and Hyderabad incorporated heat action strategies, including cooling shelters and awareness campaigns.
• National Coordination (2018): In 2018, the National Programme on Climate Change and Human Health (NPCCHH) was introduced to provide a unified approach, coordinating heat advisories and other health-related information across the country. Eg, the National Disaster Management Authority (NDMA) began issuing nationwide heatwave alerts to help states and cities prepare for extreme heat events.
• Focus on Long-Term Measures (2020-Present): Recent iterations of HAPs have emphasized long-term preventive measures, such as urban greening, reflective rooftops, and improved building materials to reduce heat retention. Eg, several cities, like Delhi, are promoting cool roof policies, encouraging the use of heat-reflective materials on buildings to reduce urban heat islands.

How can India improve the effectiveness and implementation of Heat Action Plans at the state and city levels?

• Tailor Plans Based on Local Vulnerability: India can improve HAP effectiveness by ensuring that each state and city develops plans based on specific local vulnerabilities such as geography, socio-economic factors, and infrastructure. Eg, coastal cities like Mumbai may need strategies focusing on humidity and high temperatures, while inland cities like Jaipur might need to focus more on extreme heat and dry conditions.
• Incorporate Real-Time Data and Predictive Technology: HAPs can be enhanced by using real-time data on temperature, humidity, and wind speed to improve forecasting accuracy and timely alerts. Eg, the use of satellite data and ground-based sensors in cities like Pune has allowed for more accurate predictions of heat stress, enabling better preparedness and quicker responses during heatwaves.
• Strengthen Collaboration Between Stakeholders: Successful implementation of HAPs requires coordination between government bodies, local authorities, public health institutions, NGOs, and community organizations. Eg, in Ahmedabad, the city’s HAP involved collaborations between municipal authorities, public health officials, and non-governmental organizations, which significantly contributed to the reduction in heat-related deaths.
• Focus on Long-Term Urban Planning and Infrastructure: HAPs should integrate long-term urban development strategies that mitigate heat in the built environment, such as increasing green spaces, promoting cool roofs, and using reflective materials for buildings. Eg, Chennai’s initiative to plant more trees and create shaded public spaces has helped reduce heat in urban areas, making the city more resilient to heatwaves.
• Ensure Inclusivity and Equity in Response Measures: HAPs should ensure that vulnerable populations such as informal sector workers, elderly, and marginalized communities are given special attention during heatwaves. Eg, Delhi’s HAP has included mobile cooling units and shelters for the homeless, along with providing water points and health services in areas with high concentrations of migrant workers and low-income groups.

Way forward: 

• Strengthen Policy Integration and Local Capacities: Integrate Heat Action Plans into urban planning and disaster management policies, while building capacity at local levels for climate-resilient infrastructure and real-time response systems.
• Targeted Support for Vulnerable Groups: Prioritize inclusive measures such as community cooling centers, mobile health units, and social safety nets to protect informal workers, elderly, and low-income populations from heat-related risks.

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