WBGT (°C) | WBGT (°F) | Risks and permitted activities | ||
Intermittent activites | Continuous activities | |||
Non-acclimatized, unfit, or high-risk individuals | Acclimatized, fit, low-risk individuals | |||
18.4 to 22.2 | 65.1 to 72 | Increase the rest:work ratio; monitor fluid intake | Normal activity | Risk of heat stress and other heat illnesses begin to rise; high-risk individuals should be monitored or not compete |
22.3 to 25.5 | 72.1 to 78 | Increase the rest:work ratio; decrease total duration of activity | Monitor fluid intake | Risk for all competitors is increased |
25.6 to 27.7 | 78.1 to 82 | Decrease intensity and total duration of activity | Monitor fluid intake | Risk of unfit, non-acclimatized individuals is high |
27.8 to 30 | 82.1 to 86 | Increase the rest:work ratio to 1:1; limit intense exercise; watch at-risk individuals carefully | Plan intense/prolonged activity with discretion. Watch at-risk individuals carefully | Cancel activity/competition |
30.1 to 32.2 | 86.1 to 90 | Cancel or stop practice and competition | Limit intense exercise and total exposure to heat and humidity; watch for early signs/symptoms of heat stress | |
>32.2 | >90 | Cancel exercise | Cancel exercise; heat stress exists for all athletes |
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