Abstract
The purpose of this study was to investigate the effect of green roofs and green walls on air pollution in urban Toronto. The research looked at the synergistic effects on air pollution mitigation of different combinations of vegetation by manipulating quantities of trees, shrubs, green roofs and green walls in the study area. The effects of these manipulations were simulated with the Urban Forest Effects (UFORE) model developed by the USDA Forest Service Northeastern Regional Station. While UFORE contains several modules, Module—D quantifies the levels of air pollution for contaminants such as NO2, S02, CO, PM10 and ozone as well as hourly pollution removal rates and the economic value of pollutant removal. Six vegetation scenarios were developed within the Toronto study area to compare different subsets of vegetation and their effect on air contaminants. Results of the study indicate that grass on roofs (extensive green roofs) could augment the effect of trees and shrubs in air pollution mitigation, placing shrubs on a roof (intensive green roofs) would have a more significant impact. By extension, a 10–20% increase in the surface area for green roofs on downtown buildings would contribute significantly to the social, financial and environmental health of all citizens.
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Notes
Walls of Juniper trees were chosen to represent a green wall as UFORE is able to estimate the impacts of this green wall on energy consumption, which was utilized in a parallel study. Although vines can be selected for green walls, UFORE does not simulate the impacts of vines on energy consumption. Vines would not have a significantly different impact on air quality as their LAI is similar to that of the Juniper species selected for the green walls.
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Currie, B.A., Bass, B. Estimates of air pollution mitigation with green plants and green roofs using the UFORE model. Urban Ecosyst 11, 409–422 (2008). https://doi.org/10.1007/s11252-008-0054-y
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DOI: https://doi.org/10.1007/s11252-008-0054-y