A worker collapsed and died at a construction site in 34 degrees Celsius heat at the Kau Sai Chau Public Golf Course off Sai Kung yesterday. Chan Wing-kin, 51, passed out at about 2.40pm while moving debris on the island site. His colleagues called police. A Government Flying Service helicopter was sent to airlift Chan to Eastern Hospital, where he was declared dead at 3.46pm. Chan lived with his wife and mother in Wong Tai Sin. He picked up the job as a casual worker about 10 days ago. Yesterday was the day of 'great heat', or dai shu in the Chinese lunar calendar. Elsewhere, a hiker dialled 999 on his mobile phone, saying that he feared he had heatstroke, in Tai Lam Country Park in Tsuen Wan, at about 4.55pm. The Observatory recorded a temperature of 31 degrees in Tsuen Wan. The 33-year-old man reportedly told police that he felt exhausted on a trail in the country park. Police said the man was located by firefighters shortly before 5.30pm. He was taken conscious to Princess Margaret Hospital. In another case, a 23-year-old man fainted while running to catch a bus at a terminal in Cheong Tat Road, Chek Lap Kok, at about 6.15pm, when the temperature was 33 degrees. He was taken to Princess Margaret Hospital and is in critical condition. Yesterday's highest temperature, 35 degrees, was recorded at Chek Lap Kok between 2pm and 4pm. The heatwave brought a flood of calls to an alarm system set up for elderly people to summon aid. Ma Kam-wah, executive director of the Senior Citizen Home Safety Association, said that by 8pm, 1,008 calls had been made to its emergency centre. But only 66 people needed hospital treatment. The Observatory says a southwesterly airstream will persist over South China Sea coastal areas, and the weather will continue to be fine and very hot this week.