Sun, Aug 17, 2025 page3

• Summer heat could reduce productivity, study says

  • By Yang Yuan-ting and Jake Chung / Staff reporters, with staff writer
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  Summer heat in Taiwan could result in up to a 41.3 percent reduction in productivity, according to a joint study by Academia Sinica’s Research Center for Environmental Changes, the Ministry of Labor and Harvard University’s T.H. Chan School of Public Health.

  The paper was published in the journal Nature Cities on July 29.

  The joint research team, which included Academia Sinica’s Lung Shih-chun (龍世俊), visited 101 construction workers across 10 different work sites in Taipei and New Taipei City to research how environmental heat stress affected them.

  

  People work at a construction site in Taipei in an undated photograph.

  Photo: CNA

  The data generated from on-site visits were referred to the Harvard team, who calculated the lost productivity based on temperatures and other statistics.

  The construction industry is a labor-intensive industry where workers often work outdoors for long periods, Lung said, adding that laborers were assigned three categories — light, medium and heavy — based on their tasks.

  Productivity loss due to environmental heat across all three categories was at 29 percent to 41.3 percent, she said.

  

  A Central Weather Administration map shows forecast surface temperatures across the nation today.

  Photo courtesy of the Central Weather Administration

  The study showed that the productivity of workers in a high-heat and high-humidity environment would drop by one-third to 50 percent, Lung said.

  If a worker is able to carry 100 bricks under normal circumstances, they could only carry 59 to 71 when it is hot and humid, she said.

  Workers could also face an increased risk of experiencing heat stroke or other heat injuries due to environmental heat stress, she said.

  Loss of productivity could delay construction, which would cause a drop in competitiveness, she added.

  As workers should not be exposed to an outdoor environment for at least a month after experiencing heat stroke, such an incident would affect a worker’s income negatively, she said.

  Lung said she hoped her article would provide the ministry with a reference to adjust regulations and reduce the risk of workers sustaining heat-related injuries.

  Employers could adjust working times to reduce environmental heat stress and help maintain work productivity, she added.

  In related news, the Central Weather Administration (CWA) yesterday issued an orange heat alert for Taoyuan, indicating highs of 36°C for three straight days.

  The CWA also issued a “yellow” warning for Hsinchu City, and Hsinchu and Miaoli counties in the north, and Pingtung County in the south, meaning temperatures could reach or exceed 36°C.

  The heat is expected to continue today before thicker cloud cover decreases temperatures slightly tomorrow, the CWA said, adding that they would range between 32°C and 35°C across Taiwan.

  Citing the latest data from the European Centre for Medium-Range Weather Forecasts, independent meteorologist Daniel Wu (吳德榮) said a tropical disturbance is likely to emerge southeast of Taiwan and another could form in the South China Sea in the coming days.

  However, more time is needed to see whether the two tropical disturbances would strengthen into typhoons and whether they would affect Taiwan, he said.

  Additional reporting by CNA
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