Citation :
Cooling breaks
Because of the relatively high ambient temperatures in Brazil, particularly at the northern venues, "cooling breaks" for the players were introduced.[35] Breaks can take place after the 30th minute of the first and second half of games at the referee's discretion if the Wet Bulb Globe Temperature exceeds 32 °C (90 °F).
The first cooling break in World Cup play took place during the 39th minute of the USA vs. Portugal Group G match. At the start of the match, FIFA listed the temperature at 30 °C (86 °F) with 66% humidity.[36]
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