Two former directors of the Hong Kong Observatory have joined calls for a significant overhaul of the government’s heat stress warning system for outdoor workers. Lee Boon-ying and Shun Chi-ming criticized the current system after record-breaking temperatures only prompted the lowest-level alert. They argue the index fails to accurately reflect the dangers faced by laborers working in the heat. In a joint opinion piece, the ex-directors emphasized the urgent need to protect vulnerable workers from heat-related illnesses. The current warning system has been the subject of ongoing controversy, with many believing it underestimates the actual risk to worker safety. This latest intervention from respected meteorological figures adds further pressure on the Labour Department to address the concerns and implement a more responsive and effective system.