Heat Stress: A Growing Concern for India's Population

The recent surge in heat-related illnesses and deaths in India has raised concerns about the country's preparedness to tackle the issue. According to a new study by the Council on Energy, Environment and Water (CEEW), extreme heat now poses a risk to 57% of Indian districts, home to 76% of the population. The top ten most heat-risk-prone states and UTs are Delhi, Andhra Pradesh, Goa, Kerala, Maharashtra, Gujarat, Rajasthan, Karnataka, Tamil Nadu, and Uttar Pradesh.

• ▸The World Health Organization (WHO) identifies heat stress as the leading cause of weather-related deaths, which can exacerbate underlying conditions like cardiovascular disease, diabetes, and mental health.
• ▸In dry north India, humidity over the past decade has increased by 50%, significantly raising the ‘felt’ temperature, sometimes by 3-5°C more compared to the recorded air temperature.
• ▸The National Disaster Management Authority has supported the implementation of Heat Action Plans in over 400 cities, including Ahmedabad, which has seen a substantial impact with mortality falling by about 40% after implementation.

Impact on Human Health

Heat stress can lead to a range of health problems, from mild heat exhaustion to life-threatening heatstroke. Dr. Rommel Tickoo, Director, Internal Medicine, Max Healthcare, Delhi, notes that heat stress can cause blood volume to decrease, blood vessels to widen, and can lead to cardiovascular disease exacerbations, including hypertension, heart failure, arrhythmias, and acute myocardial infarction. The long-term effects of heat stress can be devastating, with the WHO identifying it as a major contributor to weather-related deaths.

• ▸Heat exhaustion can cause symptoms such as dizziness, weakness, and profuse sweating, which can progress to more severe conditions like nausea, disorientation, and even organ dysfunction.
• ▸The Indian Meteorological Department provides early warning systems for heatwaves, which are crucial for mitigating the effects of heat stress.
• ▸The economic cost of heat stress is also significant, with worker productivity declining, and the risk of accidents rising, leading to increased economic strain.

Mitigation Strategies

To combat the growing concern of heat stress, cities like Ahmedabad have implemented innovative solutions such as "cool roofs" with reflective white paint in low-income neighborhoods, reducing indoor temperatures significantly. A combined data-driven approach is needed, incorporating climate projections and hyperlocal vulnerability assessment. This approach can help identify areas of high risk and inform targeted interventions to mitigate the effects of heat stress.

• ▸The National Action Plan on Climate Change (NAPCC) aims to promote sustainable development and reduce the country's vulnerability to climate change, including heat stress.
• ▸State governments can play a crucial role in implementing Heat Action Plans, which include early warning systems, public awareness campaigns, capacity building for health professionals, and emergency response plans.
• ▸The use of green infrastructure, such as urban forests and green roofs, can also help mitigate the urban heat island effect and reduce the risk of heat-related illnesses.

Conclusion

Heat stress is a growing concern for India's population, with significant implications for human health, economy, and overall well-being. To address this issue, a multi-faceted approach is needed, incorporating climate projections, early warning systems, and targeted interventions. By working together, we can reduce the risks associated with heat stress and create a more sustainable and resilient future for all.