Survey on Heat Stress (Heat stress Index for India)

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This study is part of a project "Heat Stress Index for India: projection for near future (HIIPROF)” sponsored by Department of Science and Technology (DST), Govt. of India (GoI) under 'Climate Change and Human Health’ network program of Climate Change. One of the objectives of the project is to develop a comfort index for India under heat stress condition so that an appropriate heat stress management plan can be formulated. The project work is being led by the Indian Institute of Technology (IIT) Delhi in partnership with 5 other collaborating Institutes across India such as IIT Kanpur, Indian Institutes of Science Education and Research (IISER) Bhopal, Ram Krishna Mission Vivekananda University (RKMVU) Kolkata, Indian Institute of Public Health (IIPH) Gandhinagar, and Sri Ramachandra University, (SRU) Chennai.

In addition to heat stress measurements at multiple sites across India, we are conducting a survey to collect data as the comfort level depends on human perception. We need as many responses as possible every day for robust statistics. We will be grateful for your support and contribution.
For any clarification, please feel free to contact us on given contacts in contact us section.


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FAQ Discussion

Heat stress is an impact of the hot environmental condition on a living body. We need to understand that Temperature is not the only factor for heat stress.
A normal human body maintains a core temperature of 37˚C, and the skin temperature is maintained at a lower temperature of nearly 32˚C. When the temperature of the surrounding increases, our body tries to maintain equilibrium by releasing heat from the body by means of heat release through convection via blood flow, emission and evaporative cooling by sweating depending upon the temperature difference between our body and the surrounding environment. However, this body mechanism is affected by relative humidity (RH), exposure to radiation and wind. In case our body does not maintain equilibrium, we start feeling discomfort or heat stress and in extreme condition, it may lead to heat stroke.

Heat stress is a combined effect of some environmental parameters, such as temperature, humidity, solar radiation and wind. Some other parameters such as dressing, food habits, living standard, and socioeconomic conditions are also responsible for heat stress.

India is the second highest populated country, spread over 3.287 million km² of the area which is around 2% of the total land mass of the World. Heat stress is one of the leading causes of mortality from environmental and natural factors in India. Mortality burden attributable to heat stress was 18.2% of total deaths due to natural cause in 2015 and was the second largest in India amongst all the natural causes (National Crime Records Bureau, 2016). For example, just in Odisha in 1998, a study by Nag et al. (2013), reported 2042 deaths due to heat. So we need to understand the stress due to heat on the human body very well so that a proper national heat action plan can be implemented.

Heat stress index is an imperial indicator for an environmental condition which is helpful to know the suitability environment for different physical activity.

This study will help us to understand the vulnerable environmental condition for the human body. This will also help us for proper planning of heat action plans which can be implemented by the administration to reduce or eliminate the loss of productivity, health and economy.

The available stress indices are developed in temperate climate region and the usability and validity of those indices for the Indian population are questionable. We need to verify their validity in Indian climate context and also may need to fine-tune those as per different climate condition and various other parameters. Hence we need an index exceptionally usable in the Indian context.

Almost all the central north, northwestern part always get high temperature. Various studies and reports have indicated most of the casualties and mortalities are seen from Telangana, Rajasthan, Bengal, Odisha, Madhya Pradesh, Gujrat and coastal part of Tamilnadu, Andhra Pradesh.

People working in outdoor hot condition or involved in physical activity are much vulnerable. People involved in the various activities, such as; defence sector people, Army, police, security personnel, farmers, drivers, a rickshaw puller, outdoor heavy labour workers and sports persons etc. However small children, old people and people with heart diseases are also under vulnerable condition.

Our Team

Prof. Sagnik Dey

Principal Investigator(PI)

Prof. Manu Mohan


Prof. Sushil Kumar Dash


Prof. S. N. Tripathi

IIT Kanpur

Prof. Ramya S. Raman

IISER Bhopal

Dr. Priya Dutta

IIPH Gandhinagar

Dr. Vidya Venugopal

SRU Chennai


Rohit Kumar

SRF, Phd Research Scholar


Project Assistant
IIT Delhi


Project Assistant
IIT Delhi

Mr. Sunil

Project Assistant
IIT Delhi

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Contact us

Call: +918130757765

Email: heatstressiit@gmail.com

Location: Centre for Atmospheric Sciences, IIT Delhi,New Delhi

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