I googled for "wet bulb calculator" and it lists 44C 10% humidity as 21C wet-bulb, which is certainly not deadly for healthy people with access to water and sha

I googled for "wet bulb calculator" and it lists 44C 10% humidity as 21C wet-bulb, which is certainly not deadly for healthy people with access to water and shade. 78% relative humidity though is 40C which is unfathomably hot. I should point out that relative humidity usually goes down when temperatures go up (because the absolute humidity rises rather slowly), so hopefully it was lower than 78% humidity. [edit] Chart from parent post is not WBT but WBGT. See e.g. https://axongroup.com/en/blog/what-wet-bulb-temperature https://axongroup.com/en/blog/what-wet-bulb-temperature for an actual wet-bulb temperature chart.