AI Article Synopsis
- The study analyzed how street trees impact the flow and spread of air pollution from traffic in a typical urban neighborhood using advanced simulations.
- It found that adding trees generally leads to small increases in pollutant levels near pedestrians, with about a 1% rise for every percent of street space occupied by vegetation.
- Significant localized variations in pollution concentration were observed, indicating the importance of including street trees in assessments of urban air quality.
Article Abstract
Flow and dispersion of traffic-emitted pollutants were studied in a generic urban neighborhood for various avenue-tree layouts by employing 3D steady RANS simulations with the realizable k-ε turbulence model. In comparison to the tree-free situation quantitative and qualitative changes with flow reversal in the wind field were observed. Low to moderate increases (<13.2%) in the neighborhood-averaged pollutant concentration were found at pedestrian level. An approximately 1% increase in the neighborhood-averaged concentration was obtained with each percent of the street canyon volumes being occupied by vegetation for occupation fractions between 4 and 14%. The overall pattern of concentration changes relative to the tree-free situation was similar for all avenue-tree layouts. However, pronounced locally restricted decreases or increases in concentration (-87 to +1378%) occurred. The results indicate the necessity to account for existing or planned avenue-trees in neighborhood scaled is dispersion studies. Their consideration is prerequisite for reliable urban air quality assessment.
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| http://dx.doi.org/10.1016/j.envpol.2014.10.015 | DOI Listing |
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