{"title":"Impact of an urban street canyon's greening configurations on its traffic-related particulate matter","authors":"Zhen Liu , Zhaowen Qiu , Na Yan , Feihong Ren","doi":"10.1016/j.uclim.2025.102365","DOIUrl":null,"url":null,"abstract":"<div><div>Roadside greening is gaining attention because it can mitigate street air pollution. To investigate the effects of greening configurations along bicycle lanes and sidewalks on exposure to traffic-related particulate matter (PM), we monitored in situ concentrations (PM10, PM2.5, PM1) in a shallow street canyon in Xi'an, China, and numerically simulated the people's exposure at common street greening scenarios with a microclimate model (ENVI-met). Field measurements showed that greenery in late winter had a higher PM removal effect than in late spring, but late spring's greenery had an overall negative effect on PM concentrations. Notably, greening is more effective at removing coarse particles (PM10) than fine particles (PM2.5, PM1). Simulation results revealed that when trees are planted at different locations on the roadway, the ranking of their PM-removal effect is sidewalk > bicycle lane > traffic lane; however, for planted shrubs, the ranking changed to bicycle lane > traffic lane > sidewalk. PM removal from simultaneous planting of greenery (shrubs, trees, tree-shrub mixes) on sidewalks and bicycle paths is not satisfactory. The greening configuration of “planting shrubs on bicycle lanes and trees on sidewalks” performed best at removing PM. These findings can provide a practical reference for optimizing street greening designs.</div></div>","PeriodicalId":48626,"journal":{"name":"Urban Climate","volume":"60 ","pages":"Article 102365"},"PeriodicalIF":6.0000,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Urban Climate","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2212095525000811","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Roadside greening is gaining attention because it can mitigate street air pollution. To investigate the effects of greening configurations along bicycle lanes and sidewalks on exposure to traffic-related particulate matter (PM), we monitored in situ concentrations (PM10, PM2.5, PM1) in a shallow street canyon in Xi'an, China, and numerically simulated the people's exposure at common street greening scenarios with a microclimate model (ENVI-met). Field measurements showed that greenery in late winter had a higher PM removal effect than in late spring, but late spring's greenery had an overall negative effect on PM concentrations. Notably, greening is more effective at removing coarse particles (PM10) than fine particles (PM2.5, PM1). Simulation results revealed that when trees are planted at different locations on the roadway, the ranking of their PM-removal effect is sidewalk > bicycle lane > traffic lane; however, for planted shrubs, the ranking changed to bicycle lane > traffic lane > sidewalk. PM removal from simultaneous planting of greenery (shrubs, trees, tree-shrub mixes) on sidewalks and bicycle paths is not satisfactory. The greening configuration of “planting shrubs on bicycle lanes and trees on sidewalks” performed best at removing PM. These findings can provide a practical reference for optimizing street greening designs.
期刊介绍:
Urban Climate serves the scientific and decision making communities with the publication of research on theory, science and applications relevant to understanding urban climatic conditions and change in relation to their geography and to demographic, socioeconomic, institutional, technological and environmental dynamics and global change. Targeted towards both disciplinary and interdisciplinary audiences, this journal publishes original research papers, comprehensive review articles, book reviews, and short communications on topics including, but not limited to, the following:
Urban meteorology and climate[...]
Urban environmental pollution[...]
Adaptation to global change[...]
Urban economic and social issues[...]
Research Approaches[...]