The paper led by Penn State College of Health and Human Development and the Purdue College of Sciences and Purdue's Institute for a Sustainable Future also flagged that Indian cities such as Delhi and Kolkata; Pakistan's Lahore; Bangladesh's Dhaka; China's Shanghai and Beijing are expected to start recording considerable "hot hours" annually even at 1.5 and 2 degree C warming over pre-industrial levels. For example, Delhi is projected to record 16 annual hot hours at 1.5°C warming which increases to 39 hot hours at 2°C and 170.7 hot hours at 3°C warming.
A wet-bulb temperature of 35°C has been proposed as a theoretical upper limit on human abilities to biologically thermoregulate. But, recent research using human subjects found this threshold to be significantly lower--in other words, even with minimal activity, the human body will not be able to cool down at a much lower temperature than thought before.
In 2022, authors and their collaborators demonstrated that the limits of heat and humidity people can withstand are lower than were previously theorised.
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