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<p>Proper vegetation configurations have been demonstrated to enhance pedestrian thermal comfort and reduce exposure to pollutants in street canyons. However, few studies of canyon environments focus on sidewalks and non-motorized vehicle lanes and lack evaluation methods that integrate thermal comfort and pollutant exposure. Therefore, this study investigated the effects of different vegetation configurations on street canyon air temperature (<i>T</i><sub>a</sub>) and PM<sub>2.5</sub> concentration (<i>C</i><sub>pm2.5</sub>) distributions under different aspect ratios (<i>AR, H/W</i> = 0.5, 1.0, 1.5) by coupling turbulence and radiation processes. Subsequently, mean <i>T</i><sub>a</sub> and <i>C</i><sub>pm2.5</sub> were calculated for sidewalks and non-motorized vehicle lanes, and the universal thermal climate index (<i>UTCI</i>) and personal intake fraction (<i>P_IF</i>) were calculated based on these data. Finally, <i>UTCI</i> and <i>P_IF</i> were subjected to cluster analysis and technique for order preference by similarity to ideal solution (TOPSIS) evaluation to derive the street canyon comprehensive environmental score (CES). The results of the study showed that in narrow street canyons in winter, the effect of vegetation configuration on thermal comfort was limited, whereas in wide street canyons, the shading effect of deciduous trees could not be ignored. In the absence of shrubs, pedestrians were exposed to a 10%–20% increase in pollutant risk. Therefore, the “deciduous trees + evergreen shrubs” strategy can offer an effective pathway toward concurrently enhancing pedestrian thermal comfort and mitigating pollutant exposure within the specific context of winter street canyons in cold regions.</p>

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Interactive effects of deciduous tree and evergreen shrub configurations on pedestrian thermal comfort and pollutant exposure within winter street canyons

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Xu Li,
  • Jizhou Liu,
  • Rongpeng Zhang,
  • Daranee Jareemit,
  • Jiying Liu

摘要

Proper vegetation configurations have been demonstrated to enhance pedestrian thermal comfort and reduce exposure to pollutants in street canyons. However, few studies of canyon environments focus on sidewalks and non-motorized vehicle lanes and lack evaluation methods that integrate thermal comfort and pollutant exposure. Therefore, this study investigated the effects of different vegetation configurations on street canyon air temperature (Ta) and PM2.5 concentration (Cpm2.5) distributions under different aspect ratios (AR, H/W = 0.5, 1.0, 1.5) by coupling turbulence and radiation processes. Subsequently, mean Ta and Cpm2.5 were calculated for sidewalks and non-motorized vehicle lanes, and the universal thermal climate index (UTCI) and personal intake fraction (P_IF) were calculated based on these data. Finally, UTCI and P_IF were subjected to cluster analysis and technique for order preference by similarity to ideal solution (TOPSIS) evaluation to derive the street canyon comprehensive environmental score (CES). The results of the study showed that in narrow street canyons in winter, the effect of vegetation configuration on thermal comfort was limited, whereas in wide street canyons, the shading effect of deciduous trees could not be ignored. In the absence of shrubs, pedestrians were exposed to a 10%–20% increase in pollutant risk. Therefore, the “deciduous trees + evergreen shrubs” strategy can offer an effective pathway toward concurrently enhancing pedestrian thermal comfort and mitigating pollutant exposure within the specific context of winter street canyons in cold regions.