With record-breaking temperatures reported not just in the United States but around the world, the report of a location in Iran having a heat index reaching 152 degrees Fahrenheit has scientists and medical researchers wondering if humans can tolerate anything higher, CNN reports.
Researchers have calculated the top threshold for environmental temperatures that humans can tolerate would be 160°F for any extended period. Should the climate continue to heat up, humans may find some areas physically too hot to handle for more than an hour or two a day.