Exposure to ambient PM_2.5 poses serious threats to human health. In such cases, the presence of green roofs (GRs) and green walls (GWs) has several environmental benefits, including the capture of pollutants. Choosing appropriate designs of GWs and GRs to improve urban air quality is challenging because their performances depend on their constituent species and environmental characteristics of the particular locality. Capture of PM_2.5 by different plant species of GRs and GWs has been measured only on monocultures. The impact of planting different species together (polycultures) on capturing PM_2.5 remains unexplored. This paper aims to evaluate the impact of biodiverse GRs and GWs on PM_2.5 capture. Seven species were analyzed as polycultures: Sedum album, Lampranthus spectabillis, Sedum spurium P, Lavandula angustifolia, Erigeron karvinskianus, Aptenia cordifolia, and Sedum palmeri. PM_2.5 capture was measured by two methods: gravimetric determination and decay curve. Gravimetric results suggest that higher the biodiversity of plants in GRs and GWs, higher the PM_2.5 capture, particularly for species with relatively low capture when used as monocultures. The ability to capture PM_2.5 is dependent on the plant species, relative position of plants within the polyculture, and horizontal (GRs) or vertical (GWs) layout. Decay method results suggest that polycultures could be more effective in long-term reduction of high PM_2.5 concentrations.

暴露于环境 PM _2.5对人类健康构成严重威胁。在这种情况下，绿色屋顶 (GR) 和绿色墙壁 (GW) 的存在具有多种环境效益，包括捕获污染物。选择适当的 GW 和 GR 设计来改善城市空气质量具有挑战性，因为它们的性能取决于它们的组成物种和特定地区的环境特征。仅在单一栽培中测量了不同植物物种的 GR 和 GW对 PM _2.5的捕获。将不同物种一起种植（混养）对捕获 PM _{2.5 的影响}仍未得到探索。本文旨在评估生物多样性 GR 和 GW 对 PM _{2.5 的影响}捕获。七种进行分析的多种栽培：景天专辑，Lampranthus spectabillis，景天假性P，薰衣草，灯盏karvinskianus，花蔓草和景天palmeri。PM _2.5捕获量通过两种方法测量：重量测定和衰减曲线。重量分析结果表明，GR 和 GW 中植物的生物多样性越高，PM _2.5捕获率越高，特别是对于作为单一栽培使用时捕获率相对较低的物种。捕获 PM _2.5的能力取决于植物种类、混养中植物的相对位置以及水平 (GR) 或垂直 (GW) 布局。衰减方法的结果表明，混养在长期降低高 PM _2.5浓度方面可能更有效。