Since being awarded the games, which will be the largest ever with 33 sports and 339 events, Tokyo organizers have had to deal with a series of problems ranging from stadium and construction delays , natural disasters and a scandal involving the official logo.
Most of the obstacles have been cleared up, but a deadly heatwave gripping Japan has focused organizers on ways to keep fans and athletes cool when the Olympics begin on July 24, 2020.
Potential for scorching summer conditions has always concerned organizers, with temperatures in central Tokyo often exceeding 35 Celsius (95 Fahrenheit) in July and August, made more difficult because of high humidity.