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Heat Stress and Heatwaves

Environment & Ecology

  • PYQs6
  • Articles1
I

Background

Critical for understanding the impacts of climate change, public health challenges, disaster management, and socio-economic vulnerabilities. Relevant for GS1 (Geography, Urbanization), GS2 (Welfare, Disaster Management), GS3 (Environment, Economy).

Heat stress refers to the body's inability to cool itself, leading to heat-related illnesses, while heatwaves are periods of abnormally high temperatures. These extreme weather events are becoming more frequent, longer-lasting, and intense globally due to climate change.

II

Facts & tables

Increasing Trend
Increasing frequency, intensity, and duration over the past decade in India, including Tamil Nadu, with average summer temperatures rising by 0.5-0.9°C in hotspots.
Contributing Factors
Amplified by high humidity, Urban Heat Island (UHI) effect, strong pre-monsoon solar heating, dry continental air, and delayed southwest monsoon activity.
Impacts
Significant impact on vulnerable populations (outdoor workers, children, elderly), affecting productivity, health, and increasing risk of heat-related illnesses.
El Nino Influence
Strengthening El Nino conditions in the tropical Pacific could influence weather patterns, rainfall, and heat risks, potentially extending warm temperatures.
Regional Heat Stress Variations in India (May 2026)
Region Observed Conditions
Tamil Nadu (North & Interior) Persistent heatwave-like conditions, 40+°C, high humidity along coast
Telangana Intense heatwave conditions, 48 heat-related fatalities
Southwest Uttar Pradesh, Madhya Pradesh, Marathwada, Vidarbha Severe heat, Banda (UP) recorded 48.3°C
Western Rajasthan Did not witness extreme temperatures this year
Static syllabus anchors
Type Reference
Conceptual area Climate Change Impacts
Conceptual area Disaster Management
Institutions & roles
Body Role
India Meteorological Department (IMD) Monitors and forecasts weather, issues warnings
Regional Meteorological Centre (RMC) Provides regional weather observations and forecasts
Tamil Nadu State Disaster Management Authority Coordinates disaster response and preparedness
III

Prelims angle

Prelims angle: Multi-statement analysis

Prelims angle: Conceptual understanding

  • Increasing frequency/intensity of heatwaves due to global warming.
  • UHI effect and high humidity amplify heat stress.
  • Impacts: public health, labor productivity, vulnerable groups.
  • El Nino's potential influence on future heat risks.
  • Need for early warning systems and localized action plans.
High-confidence PYQ links
Year Framing tags
2026 Policy measures, Multi-statement analysis
2025 Multi-statement analysis, Conceptual understanding
2024 Factual recall, Conceptual understanding
2024 Statement-based questions, Conceptual understanding
2022 Multi-statement analysis, Factual recall
2020 Multi-statement analysis, Factual recall

Timeline

  1. Climate Change Impacts

    Conceptual area

  2. Disaster Management

    Conceptual area

  3. Prelims 2020

    Multi-statement analysis, Factual recall

  4. Prelims 2022

    Multi-statement analysis, Factual recall

  5. Prelims 2024

    Factual recall, Conceptual understanding

  6. Prelims 2024

    Statement-based questions, Conceptual understanding

  7. Prelims 2025

    Multi-statement analysis, Conceptual understanding

  8. Prelims 2026

    Policy measures, Multi-statement analysis

  9. Beyond high temperatures: understanding heat stress in Tamil Nadu

    Heat stress and heatwaves are escalating extreme weather events, driven by climate change and local factors like UHI. They pose severe public health, economic, and disaster management challenges, necessitating robust adaptation and mitigation strategies.

See also

Past papers

In the news

thehindu.com

Beyond high temperatures: understanding heat stress in Tamil Nadu

Heat stress and heatwaves are escalating extreme weather events, driven by climate change and local factors like UHI. They pose severe public health, economic, and disaster management challenges, necessitating robust adaptation and mitigation strategies.

Try these PYQs

UPSC Prelims 2025 medium Environment & Ecology Open full page

The World Bank warned that India could become one of the first places where wet-bulb temperatures routinely exceed 35 °C. Which of the following statements best reflect(s) the implication of the above‐said report?

I. Peninsular India will most likely suffer from flooding, tropical cyclones and droughts.
II. The survival of animals including humans will be affected as shedding of their body heat through perspiration becomes difficult.

Select the correct answer using the code given below.

UPSC Prelims 2020 easy International Relations Open full page

Consider the following pairs

| International Agreement | Set-up Subject |
|--------------------------|----------------------------|
| 1. Alma-Ata Declaration | Healthcare of the people |
| 2. Hague Convention | Biological and chemical weapons |
| 3. Talanoa Dialogue | Global climate change |
| 4. Under2 Coalition | Child rights |

Which of the pairs given above is/are correctly matched?

UPSC Prelims 2022 medium Environment & Ecology Open full page

Consider the following statements:

1. "The Climate Group" is an international non-profit organization that drives climate action by building large networks and running them.
2. The International Energy Agency in partnership with the Climate Group launched a global initiative "EP100".
3. EP100 brings together leading companies committed to driving innovation in energy efficiency and increasing competitiveness while delivering on emission reduction goals.
4. Some Indian companies are members of EP100.
5. The International Energy Agency is the Secretariat to the "Under2 Coalition".

Which of the statements given above are correct?

UPSC Prelims 2024 medium Environment & Ecology Open full page

One of the following regions has the world's largest tropical peatland, which holds about three years worth of global carbon emissions from fossil fuels; and the possible destruction of which can exert detrimental effect on the global climate. Which one of the following denotes that region?

UPSC Prelims 2026 easy Social Issues & Schemes Open full page

Which among the following is/are the objective(s) of the Rainfed Area Development (RAD) initiative under the National Mission for Sustainable Agriculture (NMSA)?

1. Encouraging monoculture in rainfed areas
2. Increasing rice cultivation in irrigated regions
3. Enhancing productivity and minimising climatic risks through Integrated Farming Systems (IFS)

Select the answer using the code given below:

Show 1 more PYQs
UPSC Prelims 2024 easy Environment & Ecology Open full page

Consider the following statements:

Statement-I: The atmosphere is heated more by incoming solar radiation than by terrestrial radiation.
Statement-II: Carbon dioxide and other greenhouse gases in the atmosphere are good absorbers of long wave radiation.

Which one of the following is correct in respect of the above statements?