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Some tree types excel at capturing air pollutants

Air pollution from diesel exhaust, brake dust, and other particles has measurable effects on health, such as increasing the risk of asthma, heart disease, and other conditions. To try to pull that particulate matter out of air, researchers have begun looking to trees, and they found that some species have leaves with features that make them good filters for ultrafine particles (Environ. Sci. Technol. 2019, DOI: 10.1021/acs.est.8b06629). Barbara A. Maher of the University of Lancaster and her colleagues collected branches from nine tree species, washed the leaves to rid them of existing particles, and placed the branches inside a wind tunnel, exposing them to diesel exhaust and measuring air quality on either side of the branches. The efficiency of removing ultrafine particles (less than 100 nm in diameter) varied among the species, with the best-performing ones removing 70.5% (elder), 71.5% (yew), and 79% (silver birch). Trees that have leaves with