Apparel-sector heat stress guidance: the Guide v2.0 (April 2026) work/rest and hydration table, plus the September 2026 Heat Stress Toolkit risk-level bands.
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HI-to-WBGT estimate: WBGT(C) = -0.0110 * HI^2 + 1.336 * HI - 6.78| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr |
| 25 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr |
| 26 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 40 / 20 min work/rest per hr | 40 / 20 min work/rest per hr |
| 27 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 40 / 20 min work/rest per hr | 40 / 20 min work/rest per hr |
| 28 | 60 / 0 min work/rest per hr | 50 / 10 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 29 | 60 / 0 min work/rest per hr | 50 / 10 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 30 | 60 / 0 min work/rest per hr | 40 / 20 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 31 | 60 / 0 min work/rest per hr | 40 / 20 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 32 | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr | 20 / 40 min work/rest per hr | 20 / 40 min work/rest per hr |
| 33 | 50 / 10 min work/rest per hr | 20 / 40 min work/rest per hr | 10 / 50 min work/rest per hr | 10 / 50 min work/rest per hr |
| 34 | 50 / 10 min work/rest per hr | 20 / 40 min work/rest per hr | 10 / 50 min work/rest per hr | 10 / 50 min work/rest per hr |
| 35 | 50 / 10 min work/rest per hr | 20 / 40 min work/rest per hr | 10 / 50 min work/rest per hr | 10 / 50 min work/rest per hr |
| 36 | 50 / 10 min work/rest per hr | 20 / 40 min work/rest per hr | 10 / 50 min work/rest per hr | 10 / 50 min work/rest per hr |
This standard's declared inputs do not include acclimatization status, so results do not vary by it.
| Parameter | Value |
|---|---|
toolkitWbgtBandsC |
|
toolkitHeatIndexBandsC |
|
hydrationCeilingMlPerHour | 1419 |
controlFailureShiftMl | 6000 |
Toolkit band edges are the published ones. 28 C is printed in both the MODERATE and HIGH rows and resolves upward; the top row is 'Above 30 C', so exactly 30 C is HIGH. The hourly hydration ceiling is the lower of the two AAFA figures - Guide v2.0 Table 2 caps intake at 1.5 US qt/hr (1419 mL), the Toolkit at 1.5 L/hr - because the hazard the ceiling exists for (hyponatremia) is worsened by the larger number.
6000 mL is the Toolkit's per-shift figure above which it declares the heat controls failed and the area in need of engineering intervention; the Guide's '12 quarts daily' is not carried. The Toolkit is heat-only: it publishes no PM2.5 or AQI trigger.
Required inputs: wbgtC, workload
Optional inputs: none
This standard’s output changed in the reference scenarios, in a form that does not reduce to permitted work minutes (for example a screening limit, risk level, or respirator tier). Registry fields changed — parameters changed.
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