Footballers and fans heading to the World Cup in the US face a dangerous combination of heat and humidity, with growing research highlighting the health effects of high “wet-bulb globe temperatures”.
The heat-stress metric, which also takes into account sun and wind exposure, is considered dangerous above 28C — roughly equivalent to an air temperature of 38C in dry heat.
According to FT analysis, many of the host cities for the matches — including Miami, Dallas, Houston and Atlanta — are regularly experiencing WBGT above the threshold that medical experts say can harm human health.
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