title: Evaluating the role of green infrastructures on near-road pollutant dispersion and removal: Modelling and measurement.
abstract: To enhance the quality of human life in a rapidly urbanized world plagued with high transportation, the masterful contribution of improved urban and local air quality cannot be overemphasized. In order to reduce human exposure to near-road air pollution, several approaches including the installation of roadside structural barriers especially in open street areas, such as city entrances are being applied. In the present study, the air quality around real world and idealized green infrastructures was investigated by means of numerical simulation and a short field measurement campaign. Fair agreement was found between ENVI-met modelled and measured particulate matter's concentration data around a realistic vegetation barrier indicating a fair representation of reality in the model. Several numerical experiments were conducted to investigate the influence of barrier type (vegetation/hedge and green wall) and dimensions on near-road air quality. The results show different horizontal/vertical patterns and magnitudes of upwind and downwind relative concentration (with and without a barrier) depending on wind condition, barrier type and dimension. Furthermore, an integrated dispersion-deposition approach was employed to assess the impact on air quality of near-road vegetation barrier. At last, recommendations to city and urban planners on the implementation of roadside structural barriers were made.
authors.affiliation: School of Energy and Environment, City University of Hong Kong, HKSAR, China.
authors.forename: Tobi Eniolu
authors.initials: TE
authors.lastname: Morakinyo
authors.affiliation: School of Energy and Environment, City University of Hong Kong, HKSAR, China; Guy Carpenter Asia-Pacific Climate Impact Centre, City University of Hong Kong, HKSAR, China. Electronic address: yunflam@cityu.edu.hk.
authors.forename: Yun Fat
authors.initials: YF
authors.lastname: Lam
authors.affiliation: School of Energy and Environment, City University of Hong Kong, HKSAR, China.
authors.forename: Song
authors.initials: S
authors.lastname: Hao
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002947:Cities; D003198:Computer Simulation; D004784:Environmental Monitoring / Q000379:methods*; D052918:Environmental Restoration and Remediation; D057446:Hydrodynamics; D008962:Models, Theoretical; D052638:Particulate Matter / Q000032:analysis; D014507:Urbanization; D001335:Vehicle Emissions / Q000032:analysis*; D014919:Wind
chemical_list: D000393:Air Pollutants; D052638:Particulate Matter; D001335:Vehicle Emissions
keywords: CFD; Green wall barrier; Roadside air quality; Vegetation barrier