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\bibitem{Ysebaert_etal2021} {\textquotedblleft}\textit{Green walls for mitigating urban particulate matter pollution : a review}{\textquotedblright}. Ysebaert T, Koch K, Samson R, Denys S, Urban Forestry \& Urban Greening \textbf{59}, 127014 (2021).   http://doi.org/10.1016/J.UFUG.2021.127014

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