The influence of vegetation on the horizontal and vertical distribution of pollutants in a street canyon

Salmond, Jennifer; Williams, David E.; Laing, Greer; Kingham, Simon; Dirks, Kim N.; Longley, Ian; Henshaw, G.S.

doi:10.1016/j.scitotenv.2012.10.101

Cited by 184 publications

(90 citation statements)

References 36 publications

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“…Because temperatures and relative humidity are correlated negatively with each other, NO 2 correlated positively with ambient temperatures with a correlation coefficient of R 2 =0.648. These findings correlate to those reported in related studies [46,47]. 2 ) is derived from the combustion of sulfur-containing fossil fuels and is a major air pollutant in many parts of the world [2,29].…”

Section: Analysis Of No 2 Concentrationssupporting

confidence: 89%

“…The recorded data pass through rectify units and an average value is displayed. For each potential pollutant about [40][41][42][43][44][45][46][47][48][49][50] values are recorded during the operation period for one measurement of 2-3 minutes. The hourly mean concentrations of the measured pollutants during the two periods of study are registered and tabulated.…”

Section: Discussionmentioning

confidence: 99%

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Effect of Meteorological Variables on Air Pollutants Variation in Arid Climates

Radaideh¹

2017

J Environ Anal Toxicol

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Section: Analysis Of No 2 Concentrationssupporting

confidence: 89%

Section: Discussionmentioning

confidence: 99%

Effect of Meteorological Variables on Air Pollutants Variation in Arid Climates

Radaideh¹

2017

J Environ Anal Toxicol

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“…They also found increases in traffic pollutant concentrations in the presence of avenue-trees. The above mentioned findings from wind tunnel and CFD studies obtained at generic street canyon geometries were recently corroborated by a field study in a street flanked by detached buildings in Auckland, New Zealand by (Salmond et al, 2013). They measured lower wind velocities and increased traffic pollutant concentrations below the tree crowns during the leaf-on period in comparison to the leaf-off period.…”

Section: Introductionmentioning

confidence: 60%

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Gromke

Blocken

2015

Environmental Pollution

139

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a b s t r a c tFlow 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 (À87 to þ1378%) occurred. The results indicate the necessity to account for existing or planned avenue-trees in neighborhood scale dispersion studies. Their consideration is prerequisite for reliable urban air quality assessment.

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“…This county-wide modeling focused on broad-scale estimates of pollution removal by trees on air quality. At the local scale, pollution concentrations can be increased if trees: a) trap the pollutants beneath tree canopies near emission sources (e.g., along road ways, Gromke and Ruck, 2009;Wania et al, 2012;Salmond et al, 2013;Vos et al, 2013), b) limit dispersion by reducing wind speeds, and/or c) lower mixing heights by reducing wind speeds (Nowak et al, 2006a). Under stable atmospheric conditions (limited mixing), tree removal could lead to greater reductions in pollution concentrations at the ground level by limiting mixing with air pollutants above the canopy.…”

Section: Discussionmentioning

confidence: 99%

Tree and forest effects on air quality and human health in the United States

Nowak

Hirabayashi

Bodine

et al. 2014

Environmental Pollution

743

378

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a b s t r a c tTrees remove air pollution by the interception of particulate matter on plant surfaces and the absorption of gaseous pollutants through the leaf stomata. However, the magnitude and value of the effects of trees and forests on air quality and human health across the United States remains unknown. Computer simulations with local environmental data reveal that trees and forests in the conterminous United States removed 17.4 million tonnes (t) of air pollution in 2010 (range: 9.0e23.2 million t), with human health effects valued at 6.8 billion U.S. dollars (range: $1.5e13.0 billion). This pollution removal equated to an average air quality improvement of less than one percent. Most of the pollution removal occurred in rural areas, while most of the health impacts and values were within urban areas. Health impacts included the avoidance of more than 850 incidences of human mortality and 670,000 incidences of acute respiratory symptoms.Published by Elsevier Ltd.

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The influence of vegetation on the horizontal and vertical distribution of pollutants in a street canyon

Cited by 184 publications

References 36 publications

Effect of Meteorological Variables on Air Pollutants Variation in Arid Climates

Effect of Meteorological Variables on Air Pollutants Variation in Arid Climates

Influence of avenue-trees on air quality at the urban neighborhood scale. Part II: Traffic pollutant concentrations at pedestrian level

Tree and forest effects on air quality and human health in the United States

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