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Games in Miami and Monterrey were at heat level a players’ union had warned in the past should trigger delays

Two of the first round of matches at the World Cup were played at a level of severe heat that a football players’ union has previously said should trigger the delay or postponement of games, a Guardian analysis has found.

A further four games were played in cities with temperatures also beyond that level of heat, though conditions inside the stadiums were mitigated by air conditioning.