The dust reduction advantage of broad-leaved trees is obvious and the effect of adsorbing PM2 5 is the best  the average dust retention of a broad-leaved tree is 3 16kg a year  Conifers are small in area and weak in adsorbing PM2 5  On average throughout the year, the vacuuming effect of broad-leaved trees is much better than that of coniferous trees  Broad-leaved trees are also much better at vacuuming than shrubs and grasses  Take Robinia pseudoacacia, a common broad-leaved tree in Beijing, as an example, the vacuuming effect of Sophora pseudoacacia trees is about 30% higher than that of ordinary grasslands in the same area
Plant afforestation needs rational distribution to control not only PM2.5 but also other pollutants.
 On this basis, some people think that in order to reduce dust, Beijing should vigorously promote broad-leaved trees and reduce the area of coniferous forests as far as possible