Apparel-sector heat stress guide with work/rest and hydration recommendations.
Open AAFA Guide to Protecting Workers from Heat Stress 2026 in the interactive Guidance Wiki →
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.
Required inputs: wbgtC, workload
Optional inputs: none