Air temperature (typical value) WBGT Guides to how much exercise can be safely performed ≥ 35 ℃ ≥ 31 Danger (exercise prohibited) 31 ‑ 35 ℃ 28 ‑ 31 Severe Warning (heavy exercise prohibited) 28 ‑ 31 ℃ 25 ‑ 28 Warning (rests should be provided often)
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