

WBGT[℃] Types of warning and required rest 
Below 21 : Safe (needs occational supply of water) 
21 - 25  : Note (Needs immediate supply of water) 
25 – 28  : Caution (needs to take rest) 
28 – 31  : Warning (Stop active physical exercise) 
Avove 31 : Dangerous (Cancel physical exercise) 















