CO2absorption/emission and aerodynamic effects of trees on the concentrations in a street canyon in Guangzhou, China

Jian Feng Li, Jie Min Zhan, Yok Sheung Li, Wing Hong Onyx Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

17 Citations (Scopus)


In this paper, the effects of trees on CO2concentrations in a street canyon in Guangzhou, China are examined by Computational Fluid Dynamics (CFD) simulations of the concentration distribution, taking into account both the CO2absorption/emission and aerodynamic effects of trees. Simulation results show that, under a 2 m/s southerly prevailing wind condition, CO2absorption by trees will reduce the CO2concentration by around 2.5% in the daytime and at the same time the trees' resistance will increase the difference of CO2concentrations in the street and at the inflow by 43%. As the traffic density increases to 50 vehicles/min, the effect of trees on the ambient CO2concentration will change from positive to negative. At night, trees have a negative effect on the concentration in the street canyon mainly because of their resistance to airflow. When environmental wind changes, the effect of trees will be different.
Original languageEnglish
Pages (from-to)4-12
Number of pages9
JournalEnvironmental Pollution
Publication statusPublished - 15 Mar 2013


  • Airflow resistance
  • CFD simulation
  • CO absorption 2
  • CO concentration 2
  • Street canyon
  • Tree effects

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis

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