Wet‑bulb thresholds enter labor law

Countries are writing wet‑bulb temperature thresholds into workplace rules to trigger mandatory cooling measures, breaks, or stoppages. Japan fines employers when wet‑bulb hits 28C; Singapore requires hourly sensors and 15‑minute breaks each hour at 33C. This shifts heat safety from vague guidance to physiologically grounded legal triggers. — It reframes climate adaptation as enforceable, metric‑based labor regulation and exposes gaps in U.S. federal standards.