NIOSH heat guidance used for screening heat stress risk with environmental and clothing adjustments.
Open NIOSH 2016-106 Table 6-2 in the interactive Guidance Wiki →
No standalone formula is published for this standard; see programmable logic and parameters below.
Scenario: full sun exposure · 50% relative humidity
| 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 | 45 / 15 min work/rest per hr | 45 / 15 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 | 35 / 25 min work/rest per hr | 35 / 25 min work/rest per hr |
| 28 | 60 / 0 min work/rest per hr | 45 / 15 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 | 35 / 25 min work/rest per hr | 25 / 35 min work/rest per hr | 25 / 35 min work/rest per hr |
| 30 | 60 / 0 min work/rest per hr | 25 / 35 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| 31 | 45 / 15 min work/rest per hr | 20 / 40 min work/rest per hr | Stop work | Stop work |
| 32 | 35 / 25 min work/rest per hr | Stop work | Stop work | Stop work |
| 33 | 15 / 45 min work/rest per hr | Stop work | Stop work | Stop work |
| 34 | Stop work | Stop work | Stop work | Stop work |
| 35 | Stop work | Stop work | Stop work | Stop work |
| 36 | Stop work | Stop work | Stop work | Stop work |
This standard's declared inputs do not include acclimatization status, so results do not vary by it.
Required inputs: wbgtC, workload, sunExposure, relativeHumidity
Optional inputs: airTempC, nioshMetricBasis
This standard was added to the calculator.
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