Unison is calling for changes to how emergency workers are deployed during heatwaves, warning that ambulance crews may be required to work in conditions the union says are harmful to their health. The union argues that NHS trusts should strengthen protections for staff as summers become hotter and more frequent heat events occur. Under the proposal described by Unison, ambulance crews could be restricted from working when temperatures reach levels considered unsafe, which could affect response times and mean some patients who call 999 might have to wait until conditions improve. The coverage highlights that the union wants clearer safeguards and better planning by NHS trusts to manage staff exposure during extreme temperatures. The articles do not provide specific temperature thresholds or an agreed national policy, but they frame the issue as a balance between protecting workers from heat-related harm and maintaining emergency services during dangerous weather.