Hong Kong Labour Department heat stroke prevention guidance using warning tiers and workplace modifiers.
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No standalone formula is published for this standard; see programmable logic and parameters below.
Scenario: no shade · no forced ventilation/fans · no nearby heat source · standard (breathable) clothing
| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 25 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 26 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 27 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 28 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 29 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 30 | 45 / 15 min work/rest per hr | 45 / 15 min work/rest per hr | 45 / 15 min work/rest per hr | 45 / 15 min work/rest per hr |
| 31 | 45 / 15 min work/rest per hr | 45 / 15 min work/rest per hr | 45 / 15 min work/rest per hr | 45 / 15 min work/rest per hr |
| 32 | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 33 | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 34 | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| 35 | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| 36 | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 25 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 26 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 27 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 28 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 29 | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. | Below the Hong Kong Amber trigger (HKHI 30), read against WBGT as a stand-in for HKHI. |
| 30 | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 31 | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 32 | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| 33 | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| 34 | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr |
| 35 | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr |
| 36 | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr | 0 / 60 min work/rest per hr |
Required inputs: wbgtC, workload, shade, ventilation, heatSource, ppe, acclimatization
Optional inputs: none
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