Different Concentrations of TSP, PM10, PM2.5, and PM1 of Several Urban Forest Types in Different Seasons

In this study, six types of urban green land in Beijing Olympic Park, including grassland, shrub, conifer, broadleaf tree, mixed trees, and a control, were selected to study the relationship between urban green land and particulate matter (PM). For all particles -coniferous tree forest type, broadleaf tree forest type, and broadleaf and coniferous mixed trees type -the common point was that they have big leaf areas that can absorb a large number of particles. So the concentrations in the three forest types were very low. Leaf area is a big factor for absorbing and reducing concentrations of four types of particles.