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<p>The interaction between various greening forms and the heating conditions of building walls in street canyons significantly influences both pedestrian thermal comfort and the traffic-related pollutants distribution. In this study, six types of greening forms and three wall heating conditions were simulated. The study shows that of the various urban greening strategies, street trees and vertical vegetation most significantly alter airflow dynamics and enhance air quality. When combining multiple greening approaches, the integration of vertical wall greening and hedges yields the most favorable outcome for enhancing pollutant dispersion. The windward wall heating substantially alters the airflow structure, whereas leeward wall heating exerts the least influence. Under conditions where all three walls are heated, thermal buoyancy dominates the flow dynamics within the canyon, leading to significant changes in airflow and a notable improvement in ventilation performance, with an 8.99% increase in air exchange rate (ACH). Consequently, pollutant concentrations within the canyon are significantly reduced, with an average decrease of 34.75%. This study examines how wall heating and different greening forms collectively influence pollutant dispersion in street canyons, providing key insights into the mechanisms by which thermal effects and greening alter airflow dynamics and pollutant distribution. This study provide valuable guidance for optimizing urban greening strategies to improve air quality in densely populated environments.</p>

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Influence of greening forms and building wall heating conditions on traffic pollutant dispersion inside canyons

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Qianfeng Liang,
  • Cheng Yao,
  • Dingyue Chu,
  • Wencheng Liu,
  • Rong Ji,
  • Yuandong Huang,
  • Yang Luo

摘要

The interaction between various greening forms and the heating conditions of building walls in street canyons significantly influences both pedestrian thermal comfort and the traffic-related pollutants distribution. In this study, six types of greening forms and three wall heating conditions were simulated. The study shows that of the various urban greening strategies, street trees and vertical vegetation most significantly alter airflow dynamics and enhance air quality. When combining multiple greening approaches, the integration of vertical wall greening and hedges yields the most favorable outcome for enhancing pollutant dispersion. The windward wall heating substantially alters the airflow structure, whereas leeward wall heating exerts the least influence. Under conditions where all three walls are heated, thermal buoyancy dominates the flow dynamics within the canyon, leading to significant changes in airflow and a notable improvement in ventilation performance, with an 8.99% increase in air exchange rate (ACH). Consequently, pollutant concentrations within the canyon are significantly reduced, with an average decrease of 34.75%. This study examines how wall heating and different greening forms collectively influence pollutant dispersion in street canyons, providing key insights into the mechanisms by which thermal effects and greening alter airflow dynamics and pollutant distribution. This study provide valuable guidance for optimizing urban greening strategies to improve air quality in densely populated environments.