ISA Certified Arborist Practice Exam

What is one effect of tree canopy on urban environments?

1. It reduces noise pollution.

2. It increases temperatures in the streets.

3. It limits street lighting visibility.

4. It enhances wind speed near the ground.

The correct answer is: It reduces noise pollution.

The effect of tree canopy on urban environments is significant, and one of its primary benefits is the reduction of noise pollution. Trees can act as natural sound barriers; their leaves and branches absorb, deflect, or refract sound waves. This helps to decrease the intensity of noise from traffic and other urban activities, creating a more peaceful environment for residents and wildlife alike. In contrast to the other options, which suggest negative effects, the presence of a tree canopy provides numerous advantages. For instance, while it might be argued that tree cover could limit visibility for street lighting, well-planned landscaping often enhances safety by providing adequate light while still reaping the benefits of shade and decreased noise levels. Additionally, trees help to lower surface and air temperatures, making urban areas more comfortable during hot months rather than increasing temperatures. Lastly, rather than enhancing wind speed near the ground, tree canopies typically slow down wind movement, further contributing to a more pleasant urban atmosphere.