"We have followed instructions about fighting the heat from the radio and also searched for all the shaded areas in the site just in case. We are just going to hide here during the hottest period."

Wang and his friends had brought handheld electric fans and sun cream with them. They also found the mist spray system cooling and a source of amusement. The site's spray systems have proved a welcome attraction for many.

There was a noticeable increase in the number of visitors who choose to enter the site after 5pm yesterday to avoid the heat. Around 30,000 visitors entered the site after 5pm.

To satisfy demand for night tickets, organizers have extended the hours of sale from 8pm to 8:50pm. Visitors have to enter before 9pm.

Since the Expo opened, organizers have added nearly 100,000 square meters of shaded areas along with more fans and mist spray systems.

Large ice blocks are provided when the temperature reaches 35 degrees. Organizers are planning to give out free fans and start selling green bean soup, a traditional dish said to help eliminate heat from the body.

The Japan Pavilion has added a dozen fans for the benefit of queueing visitors.

The five medical stations at the site had received a total of 456 patients by 4pm, about the same as usual.

One in Zone B, run by the Renji Hospital, treated around 30 people suffering from sunstroke, about 30 percent more than in previous days.