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This application shows how the Physiological Equivalent Temperature or PET has changed from 2000 to 2013 in the top 500 largest cities in the Contiguous United States.
The technical definition of the PET or Physiological Equivalent Temperature is a method to measure the air temperature at which, in a typical indoor setting (without wind and solar radiation), the heat budget of the human body is balanced with the same core and skin temperature as under the complex outdoor conditions to be assessed. In other words, the PET measures thermal comfort based on temperature, humidity, wind speed, solar radiation, and clothing. Based on this study, there is evidence to suggest that the PET may do a better job at measuring heat stress than other measures like WBGT and UTCI.