Currently no sustainable, economical and scalable systems have been developed for the direct removal of roadside air pollutants at their source. Here we present a simple and effective air filtering technology: botanical biofiltration, and the first field assessment of three different botanical biofilter designs for the filtration of traffic associated air pollutants – NO₂, O₃ and PM_2.5 – from roadside ambient air in Sydney, Australia. Over two six month research campaigns, we show that all of the tested systems filtered NO₂, O₃ and PM_2.5 with average single pass removal efficiencies of up to 71.5%, 28.1% and 22.1% respectively. Clean air delivery rates of up to 121 m³/h, 50 m³/h and 40 m³/h per m² of active green wall biofilter were achieved for the three pollutants respectively, with pollutant removal efficiency positively correlated with their ambient concentrations. We propose that large scale field trials of this technology are warranted to promote sustainable urban development and improved public health outcomes.

目前，还没有开发出可持续的，经济的和可扩展的系统来直接清除路边空气污染物。在这里，我们介绍一种简单有效的空气过滤技术：植物生物过滤，并首次对三种不同的植物生物过滤器设计进行现场评估，以从悉尼的路边环境空气中过滤与交通相关的空气污染物（NO ₂，O ₃和PM _2.5）。澳大利亚。经过两个多月的研究活动，我们发现所有测试过的系统均过滤了NO ₂，O ₃和PM _2.5，平均单程去除效率分别高达71.5％，28.1％和22.1％。清洁空气输送率高达121 m ³/ h，活性绿墙生物滤池每m ²分别达到50 m ³ / h和40 m ³ / h ，活性污染物的去除效率与环境浓度呈正相关。我们建议有必要对该技术进行大规模的现场试验，以促进可持续的城市发展和改善公共卫生成果。