Understanding the Role of Wall Plants in Air Quality Improvement

Wall plants are not just decorative; they improve urban air quality by absorbing pollutants and facilitating dry deposition, where particles settle on vegetation. They also act as barriers, dispersing pollutants and reducing exposure. Trees are ideal, but green walls can be effective in limited spaces.

What is one of the main pollutants released by traffic that wall plants can help remove?

• Carbon dioxide

• Tiny particles

• Oxygen

• Water vapor

How do plants primarily help in removing pollutants from the air?

• By absorbing them through roots

• Through dry deposition

• By releasing oxygen

• By increasing humidity

What is dry deposition in the context of air quality?

• The evaporation of water from leaves

• The release of oxygen by plants

• Particles landing on vegetation

• The process of plants absorbing water

How do plants act as a physical barrier to pollutants?

• By increasing the temperature

• By dispersing pollutants away from direct exposure

• By blocking sunlight

• By absorbing all pollutants

What is a suitable alternative to trees for improving air quality in limited spaces?

• A metal fence

• A small pond

• A 100 square centimeter green wall

• A concrete wall