Green infrastructure for air quality improvement in street canyons.
Green infrastructure for air quality improvement in street canyons.
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DOI：
10.1016/j.envint.2020.106288
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发表时间：
2021-01
影响因子：
11.8
通讯作者：
Mamatha Tomson;Prashant Kumar;Y. Barwise;P. Perez;H. Forehead;K. French;L. Morawska;J. Watts
中科院分区：
文献类型：
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作者：
Mamatha Tomson;Prashant Kumar;Y. Barwise;P. Perez;H. Forehead;K. French;L. Morawska;J. Watts
街道峡谷通常是高度污染的城市环境，由于高交通排放和阻碍分散。绿色基础设施（GI）是一种潜在的街道峡谷空气污染被动控制系统，但最佳GI设计目前还不清楚。这篇综述巩固了以往关于街道峡谷GI的研究结果，并评估了不同GI形式对当地空气质量改善的适用性。对各种地理标志方案（树木、树篱、绿色墙、绿色屏风和绿色屋顶）的影响进行了严格评估，综合了研究结果，并总结了可能的建议。此外，亦分析了各种量化街道绿化减少空气污染成效的方法。最后，我们探讨了比较植物物种的研究结果，以减轻污染。我们的结论是，不同的GI选项对街道峡谷空气质量的影响取决于街道峡谷的几何形状，气象条件和植被特征。绿色墙、绿色屏幕和绿色屋顶是现有街道峡谷中潜在可行的GI选项，这些街道峡谷通常缺乏可用的种植空间。颗粒沉积到叶片通常通过叶片洗涤实验或通过显微镜成像技术来量化，后者指示尺寸分布并且更准确。一种植物的污染物减排能力在很大程度上取决于其与物理环境的关系。某些微形态特征也与沉积物呈正相关，包括沟、脊、毛状体、气孔密度和上表皮蜡量。街道峡谷环境的复杂性和数量有限的新形式的GI在街道峡谷以前的研究意味着，提供具体的建议是目前不可行的。这篇评论强调了需要进一步的研究，特别是对绿色墙和绿色屏幕，以证实其功效和调查技术考虑。
Street canyons are generally highly polluted urban environments due to high traffic emissions and impeded dispersion. Green infrastructure (GI) is one potential passive control system for air pollution in street canyons, yet optimum GI design is currently unclear. This review consolidates findings from previous research on GI in street canyons and assesses the suitability of different GI forms in terms of local air quality improvement. Studies on the effects of various GI options (trees, hedges, green walls, green screens and green roofs) are critically evaluated, findings are synthesised, and possible recommendations are summarised. In addition, various measurement methods used for quantifying the effectiveness of street greening for air pollution reduction are analysed. Finally, we explore the findings of studies that have compared plant species for pollution mitigation. We conclude that the influences of different GI options on air quality in street canyons depend on street canyon geometry, meteorological conditions and vegetation characteristics. Green walls, green screens and green roofs are potentially viable GI options in existing street canyons, where there is typically a lack of available planting space. Particle deposition to leaves is usually quantified by leaf washing experiments or by microscopy imaging techniques, the latter of which indicates size distribution and is more accurate. The pollutant reduction capacity of a plant species largely depends on its macromorphology in relation to the physical environment. Certain micromorphological leaf traits also positively correlate with deposition, including grooves, ridges, trichomes, stomatal density and epicuticular wax amount. The complexity of street canyon environments and the limited number of previous studies on novel forms of GI in street canyons mean that offering specific recommendations is currently unfeasible. This review highlights a need for further research, particularly on green walls and green screens, to substantiate their efficacy and investigate technical considerations.