Japan workplace heatstroke prevention guidance and public WBGT warning bands.
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The drag-to-check calculator needs JavaScript. Every value it can show is a row of the table below, which is computed by the same engine.
No standalone formula is published for this standard; see programmable logic and parameters below.
| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | Safe (below 25) | Safe (below 25) | Safe (below 25) | Safe (below 25) |
| 25 | Caution (25–28) | Caution (25–28) | Caution (25–28) | Caution (25–28) |
| 26 | Caution (25–28) | Caution (25–28) | Caution (25–28) | Caution (25–28) |
| 27 | Caution (25–28) | Caution (25–28) | Caution (25–28) | Caution (25–28) |
| 28 | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often |
| 29 | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often |
| 30 | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often | Warning (28–31) — rests should be provided often |
| 31 | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted |
| 32 | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted |
| 33 | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted |
| 34 | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted | Severe Warning (31–35) — heavy exercise/work should be restricted |
| 35 | Extreme (>35) — stop work | Extreme (>35) — stop work | Extreme (>35) — stop work | Extreme (>35) — stop work |
| 36 | Extreme (>35) — stop work | Extreme (>35) — stop work | Extreme (>35) — stop work | Extreme (>35) — stop work |
This standard's declared inputs do not include acclimatization status, so results do not vary by it.
Required inputs: wbgtC
Optional inputs: japanWbgtC, japanWbgtSource
Recovered from repository history: optionalInputs changed. The direction of the safety effect was not computed, because reproducing it would require running the engine as it stood on that date.
This standard was added to the calculator.
Get notified when Japan MHLW WBGT Warning System changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
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