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This digital document is a journal article from Chemosphere, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.

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In order to screen for the best species for mitigating nitrogen dioxide (NO"2) by plants at urban levels, we investigated assimilation of nitrogen dioxide by 70 taxa of woody plants that are mostly utilized as roadside trees. They were fumigated with ^1^5N-labeled NO"2 at 0.1@mll^-^1 for 8h, and the amount of reduced nitrogen derived from NO"2 (in mg Ng^-^1 dry weight) in the leaves (designated NO"2 assimilation capability hereafter) were determined. Data were analyzed in the comparison with the previously reported ones obtained at 4@mll^-^1 NO"2. Among the 70 taxa, the value of NO"2 assimilation capability differed by a factor of 122 between the highest (Prunus yedoensis; 0.061) and the lowest (Cryptomeria japonica; 0.0005). Based on the analysis of NO"2 assimilation capability values at 0.1 and 4@ml^-^1 NO"2, the 70 taxa of woody plants appeared to be classified into four types; those of high NO"2 assimilation and high NO"2 resistance, those of high NO"2 assimilation but low NO"2 resistance, those of low NO"2 assimilation and low NO"2 resistance, and those of low NO"2 assimilation but high NO"2 resistance. The first, second, third and fourth types include 13, 11, 35 and 11 taxa, respectively. The broad-leaf deciduous trees may have advantages of high biomass and fast growth as compared with woody plants of other habits. Thus, four broad-leaf deciduous species, Robinia pseudo-acacia, Sophora japonica, Populus nigra and Prunus lannesiana, were concluded here to be the best phytoremediators for the urban air.

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