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Risk levels and WBGT ranges for intermittent recreation dependent on acclimation
| Risk | WBGT (°C) | Non-acclimated | Acclimated |
|---|---|---|---|
| Level 0 | < 18.4 | Minimal risk | Minimal risk |
| Level 1 | 18.4–22.3 | Increased risk | Minimal risk |
| Level 2 | 22.3–25.7 | Moderate risk | Increased risk |
| Level 3 | 25.7–27.9 | Moderate to high risk | Increased to moderate risk |
| Level 4 | 27.9–30 | Very high risk | Moderate to high risk |
| Level 5 | > 30.0 | Extremely high risk | Extremely high risk |
