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Green plants can effectively retain atmospheric particle pollution and purify the air. As an important part of the campus ecosystem, they have a significant effect on absorbing atmospheric pollutants and improving the quality of the campus air environment. Six common greening plants were selected as the object in Xiangnan University. The dust retention capacity of plant leaves, leaf micro-structure, and leaf contact angle were measured. The results show that the highest amounts of dust removed by  Osmanthus fragrans  Lour was 3.451 g/m 2 , and the least amounts of dust removed by  Magnolia denudata Desr . was 1.005 g/m 2 , and the maximum is 4.148 times of the minimum. The micro-structure of the plant leaf surface affects the amount of dust retention. The plant dust retention capacity with gully of the leaf surface and fluff, stomata, and sawtooth structure is relatively strong; The plant dust retention capacity with smooth, wax layer, leathery, and gully is relatively weak. The leaf contact area of a plant is related to its dust retention ability, that is, when the measured leaf contact angle is &lt;90°, the leaf dust retention ability of the plant is strong. When the blade contact angle is &gt;90°, the dust retention capacity is weak.

Relationship between leaf dust retention capacity and leaf microstructure of six common tree species for campus greening