Let's discard this topic if it's been posted elsewhere. Thanks.
https://www.natlawreview.com/article/judge-finds-no-scientific-basis-nws-heat-index-chart-used-osha-heat-stress-cases?fbclid=IwAR3GqCKx7x0of72DYREF9X-mU7e34H2ECMQfyr71R0tmeJE_XTG9NtwkkdY
May be replaced by WBGT (Wet Bulb Globe Temperature- 82 might be a threshold). I'm not studied on this and I'll try to get more info and add to this topic and if there is any predictive data to view.