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<p>Millions of people use urban underground spaces daily, yet their subjective thermal comfort during commuting remains poorly quantified. Here, analyzing over 85,000 crowdsourced posts from commuters in Boston, London and New York, this study reveals widespread thermal discomfort in metro systems, with recurrent peaks by hour, day of the week, and season. These findings can help policymakers and transit operators better anticipate, mitigate and adapt to the unwanted effects of extreme heat in urban underground environments.</p>

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Thermal discomfort in urban underground metro systems

  • 期刊论文

  • 发表日期：

    2026年3月10日

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  • Giorgia Chinazzo,
  • Alessandro F. Rotta Loria

摘要

Millions of people use urban underground spaces daily, yet their subjective thermal comfort during commuting remains poorly quantified. Here, analyzing over 85,000 crowdsourced posts from commuters in Boston, London and New York, this study reveals widespread thermal discomfort in metro systems, with recurrent peaks by hour, day of the week, and season. These findings can help policymakers and transit operators better anticipate, mitigate and adapt to the unwanted effects of extreme heat in urban underground environments.