The removal effect of NO_X (nitrogen-oxides) is an important factor for finding the material cycle in urban environment. But there are few investigations carried out to characterize the removal efficiency of air pollutants by plants. In this paper, the removal effect of NO_X by adsorbing and absorbing on plants was studied experimentally. The chamber having NO_X concentration such as atmosphere environment was designed for the experiment. Plants were exposed to the environmental concentration level of NO_X in the chamber designed for the experiment, and the removal effects of partitioned parts of plants were evaluated as a NO_X sorption flux calculated by measurement data of decreasing trend for NO_X concentration in the chamber. The correlation of NO_X sorption velocity and C0_2 absorption velocity was evaluated.
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