Fig. 1

Dust deposition of plant leaves at different locations on urban streets. “*” indicate that the indicators have reached a significant difference at the p < 0.05 level, and “**” indicate that the indicators have reached a significant difference at the p < 0.01 level. T1: outer sidewalk area (slightly polluted area of atmospheric particulate matter), T2: area between the relief road and the sidewalk (moderately polluted area of atmospheric particulate matter), T3: area in the middle of the main road (heavy pollution area of atmospheric particulate matter)