Li Li, Zheng Mingqian, Zhang Jing, Li Cuihuan, Ren Yuan, Jin Xinjie, Chen Jian
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China.
State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Lin'an, 311300, China.
Environ Res. 2023 Apr 15;223:115493. doi: 10.1016/j.envres.2023.115493. Epub 2023 Feb 13.
Urban green infrastructure (GI) has been widely demonstrated to effectively improve air quality in the built environment. However, due to the lack of comparative studies of the effects of different GI forms on PM dispersion, optimal GI designs suitable for different urban road types currently remain unclear. In this study, we adopted different roadside GI types in Hangzhou city as case studies and used the ENVI-met model to compare the effects of the different GI forms on PM dispersion and human exposure to PM. The results indicated that 1) In open roads, the concave-shaped GI type could effectively reduce PM aggregation and human exposure on motorways, and the all-tree GI type performed the best in terms of sidewalk PM purification. 2) In street canyons, green roof and green screen were highly conducive to PM concentration reduction under commuter exposure compared with traditional green solutions. 3) There were trade-offs in the GI-PM interaction. GI types which can reduce pedestrian exposure tend to increase exposure in motorways. The same GI type deployed along the two different road types could yield completely opposite dispersion effects. Novel GI types had better environmental performance and relatively high economic cost. All decision-making should be based on the trade-offs between the advantages and disadvantages of GI. Our study also highlights the importance of comprehensive consideration of GI and road types and local wind conditions in future urban road planning and GI applications.
城市绿色基础设施（GI）已被广泛证明能有效改善建成环境中的空气质量。然而，由于缺乏对不同GI形式对颗粒物（PM）扩散影响的比较研究，目前尚不清楚适合不同城市道路类型的最佳GI设计。在本研究中，我们以杭州市不同的路边GI类型为案例研究，并使用ENVI-met模型比较不同GI形式对PM扩散和人体暴露于PM的影响。结果表明：1）在开阔道路上，凹形GI类型能有效减少高速公路上的PM聚集和人体暴露，全树GI类型在人行道PM净化方面表现最佳。2）在街道峡谷中，与传统绿色解决方案相比，绿色屋顶和绿色屏障在通勤者暴露情况下对降低PM浓度非常有利。3）GI与PM的相互作用存在权衡。能减少行人暴露的GI类型往往会增加高速公路上的暴露。沿两种不同道路类型部署相同的GI类型可能会产生完全相反的扩散效果。新型GI类型具有更好的环境性能，但经济成本相对较高。所有决策都应基于GI优缺点之间的权衡。我们的研究还强调了在未来城市道路规划和GI应用中综合考虑GI、道路类型和当地风况的重要性。
