A recent analysis by the Indian Meteorological Department (IMD) has revealed a significant increase in heat stress due to high temperatures and humidity over India over the past 40 years. The study found that the magnitude of heat stress has risen by almost 30% in India over the past 40 years, with a significant upward trend in the spatial range of areas facing heat stress. The study found that two primary patterns - dry or moist heat stress conditions - trigger heat waves across India.