Study on the Correlation Mechanism between the Living Vegetation Volume of Urban Road Plantings and PM2.5 Concentrations

To study the effects of species diversity different urban road green space on PM2.5 reduction, and to provide a theoretical basis for optimal design plantings. Different combinations plantings in Xianlin Avenue Nanjing were used as sample areas, 3–6 monitoring points set up each area. The setup at 10, 20, 30, 40, 50, 60 m from roadbed detecting concentrations areas. Moreover, living vegetation volume area was calculated. coupling relationship between volumes areas evaluated by regression fitting other methods. among significantly different. higher morning than afternoon, while differences not significant. eight varied 2038.73 m3 15,032.55 m3. Affected plant configurations, showed obvious differences. S2 S6 area, which consisted large number shrubshave better reduction capability. curve S1 S3–S8 can explain 76.4% change concentrations, significant fitting. is owing compositions With increase volumes, their functions first then decrease certain range. It speculated that only when exceeds range, it will promote reduction.