Table 2.
Heat alert warning triggering criteria in selected Japanese cities.
| City | Warning triggering criteria |
|---|---|
| Kusatsu (Shiga) | WBGT exceeds 28 °C AND (atmospheric) temperature exceeds 31 °C. |
| Kumagaya (Saitama) | Rank 1: Safe (<21 °C) |
| Rank 2: Attention (≥21 °C) | |
| Rank 3: Warning (≥25 °C) | |
| Rank 4: Strong Warning (≥28 °C) | |
| Rank 5: Danger (≥31 °C) | |
| Tajimi (Gifu) | WBGT exceeds 28 °C AND (atmospheric) temperature exceeds 31 °C. |
| Obu (Aichi) | Red WBGT(≥31 °C) |
| Orange 28 °C≤ WBGT <31 °C | |
| Yellow 25 °C ≤ WBGT < 28 °C (Warning threshold) | |
| Green 21 °C ≤ WBGT < 25 °C | |
| Blue WBGT < 21 °C | |
| Machida (Tokyo) | WBGT exceeds 28 °C AND (atmospheric) temperature exceeds 31 °C. |