'Medical experts in Japan are to add a “most severe” category to the current heatstroke index, amid warnings that the extreme heat is straining medical services and causing damage to public health comparable to that in a “natural disaster”.'

https://www.theguardian.com/world/article/2024/jul/10/japan-adds-most-severe-category-to-its-heatstroke-index-amid-deadly-summer