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The impact of trees on the dispersion of traffic emission

Trees can influence the quality of the air in busy streets. The influence of trees on air quality is determined by various factors, such as wind and the density of the tree canopy.

Wind plays an important role in the dispersion of emissions, but this is affected by trees. When trees form a dense canopy, dispersion is reduced. This has an adverse effect on air quality. However, trees can also act as a filter because pollutants are deposited on the leaves. This has a positive effect on air quality.

Net effect

The net effect on air quality is determined by the interplay of the two factors mentioned above. TNO is carrying out research into this, using methods including wind-tunnel measurements.

Sander Jonkers MSc

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Sander Jonkers MSc

  • modelling air quality
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