Tran Ngoc Dang is with the Department of Environmental Health, Faculty of Public Health, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam, and the Institute of Research and Development, Duy Tan University, Da Nang City, Vietnam. Doan Quang Van and Hiroyuki Kusaka are with the Center for Computational Sciences, University of Tsukuba, Tsukuba, Japan. Xerxes T. Seposo is with the Department of Environmental Engineering, Kyoto University, Kyoto, Japan. Yasushi Honda is with the Faculty of Health and Sport Sciences, University of Tsukuba.
Am J Public Health. 2018 Apr;108(S2):S137-S143. doi: 10.2105/AJPH.2017.304123. Epub 2017 Oct 26.
To quantify heat-related deaths in Ho Chi Minh City, Vietnam, caused by the urban heat island (UHI) and explore factors that may alleviate the impact of UHIs.
We estimated district-specific meteorological conditions from 2010 to 2013 using the dynamic downscaling model and calculated the attributable fraction and number of mortalities resulting from the total, extreme, and mild heat in each district. The difference in attributable fraction of total heat between the central and outer districts was classified as the attributable fraction resulting from the UHI. The association among attributable fraction, attributable number with a green space, population density, and budget revenue of each district was then explored.
The temperature-mortality relationship between the central and outer areas was almost identical. The attributable fraction resulting from the UHI was 0.42%, which was contributed by the difference in temperature distribution between the 2 areas. Every 1-square-kilometer increase in green space per 1000 people can prevent 7.4 deaths caused by heat.
Green space can alleviate the impacts of UHIs, although future studies conducting a heath economic evaluation of tree planting are warranted.
量化越南胡志明市因城市热岛（UHI）导致的与热相关的死亡人数，并探讨可能减轻 UHI 影响的因素。
我们使用动力降尺度模型估算了 2010 年至 2013 年各地区的特定气象条件，并计算了每个地区总热量、极端热量和温和热量导致的归因分数和死亡人数。中心区和外围区总热量归因分数的差异被归类为 UHI 导致的归因分数。然后探讨了归因分数、每个区的归因人数与绿地、人口密度和预算收入之间的关联。
中心区和外围区的温度-死亡率关系几乎相同。由 UHI 导致的归因分数为 0.42%，这是由这两个区域之间的温度分布差异造成的。每 1000 人增加 1 平方公里的绿地可预防 7.4 人因热导致的死亡。
尽管未来有必要对植树造林进行健康经济评估的研究，但绿地可以减轻 UHI 的影响。
