Comparison of few heat guidelines across sports and countries with regard to the risk of heat-related illnesses
| Risk category | FIFA | ACSM | SMA | Football Australia | BOKSMART | US soccer | ||
| WBGT (°C) | WBGT (°C) | WBGT (°C) | WBGT (°C) | WBGT (°C) | WBGT (°C) | |||
| CAT 1 | CAT 2 | CAT 3 | ||||||
| Low | <24 | <22 | <28 | <26 | <24 | <27 | <28 | |
| Moderate | 24–29 | 22–25 | 28–30* | 26–28* | 25–29 | 27–30* | 28–31* | |
| High | 30–32 | 26–28 | 31–33 | >28* | 29–30 | 31–32 | 32–33 | |
| Extreme | >32*† | >28† | >33† | >28† | >30*† | >32† | >33† | |
*Recommendation to introduce mandatory drinks breaks.
†Recommendation to cancel game.
ACSM, American College of Sports Medicine; CAT, category (CAT 1, 2 and 3 in US Soccer guidelines grouped by geographical location of venue); FIFA, Fédération Internationale de Football Association; SMA, Sports Medicine Australia; WBGT, Wet Bulb Globe Temperature.