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Japan's New Word for Deadly Heat: 'Kokushobi' — and It's Already Here

The Guardian·Tuesday, 28 July 2026
Japan's New Word for Deadly Heat: 'Kokushobi' — and It's Already Here

Japan recorded its first official 'kokushobi' or 'cruelly hot day' — a new term introduced in April for temperatures above 40 degrees Celsius. The Japan Meteorological Agency created the designation to warn the public about heat that was once rare but is now becoming more frequent. Authorities have advised workers to wear shorts to the office to cope.

Why It Matters

Extreme heat is a growing reality across Asia, including India. Japan officially naming and tracking 40-degree days reflects how climate change is forcing governments to rethink public safety.

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