DeVincenzo emphasized that more measures must protect people entering venues, exiting matches, or visiting fan festivals.
"Spectator experiences created a secondary risk in the heat; factors such as long walking distances without cover, unshaded areas, sun-exposed seating, and long wait times in heat-emitting spaces like parking lots put people at a much higher risk of heat stress and related injuries."
"These experiences can be addressed ahead of future games by training volunteers to identify signs of heat stress and to know the appropriate actions to take when fans experience dizziness, fainting, or falls," he said.
Every match scheduled in Dallas, Houston, and Miami appeared to breach the 33.9C (93F) threshold.
At Miami's non-air-conditioned Hard Rock Stadium, WBGT readings reached approximately 32.5C (90.5F) during the Norway v England match.
Future international tournaments are expected to face similar climate obstacles. The 2030 World Cup will be hosted across Spain, Portugal, and Morocco, regions already experiencing extreme heat.
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Saudi Arabia is expected to host the 2034 tournament during the northern hemisphere winter to avoid summer temperatures that routinely surpass 40C (104F).
