Nowdays, as the concern about air pollution is rising, people are searching for new solutions to mitigate emissions. One of the suggested solutions is vertical gardens and nowdays many cities around the world are turning to it.

As the name suggests, vertical gardens are grown on a vertically suspended panel. These structures can eiter be freestanding or attached to a wall. Vertical gardens have been used since ancient civilizations (for example hanging gardens of Babylon); many modern vertical gardens can last for decades and give a pop of nature into the modern day business.

For cities with urban and environmental problems, having vertical gardens is a particularly important decision. In urban environments, already so scarce green cover has become necessary to plant roofs and vertical walls, which beautifies the environment, cleans and moisturizes the air, helps to solve environmental problems.

The examples of vertical gardens are in Mexico City, on structural columns that support flyovers and elevated roads around the city. The outcomes that result from these vertical gardens are impressive. This project will produce oxygen for more than 25000 people per year, take in more than 27000 tons of harmful gases, and capture more than 11000 pounds of dust.

China is building Nanjing Green Towers, which will provide 25 tons of CO₂ absorption each year and will produce about 60 kg of oxygen per day. Nanjing is one of the most air polluted cities in China, so they will very much benefit from this project.

Paris has shown that vertical gardens also reduce significant amounts of air pollution in “street canyons”, which are the corridors between tall buildings. The way this works is the vertical garden in a street canyon traps or sucks up large amounts of nitrogen  dioxide and particulate matter, which are both major air pollutants.

References: https://medium.com/cleantech-rising/the-bloom-of-vertical-gardens-a4c286e9b865