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
Broad-leaved trees lose their leaves in winter and the maintenance cost of broad-leaved trees is much higher than that of coniferous trees in cold winter.
 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