🌿 Green Roofs and Vertical Gardens: A Solution to Combat Air Pollution in Chicago

Kolmena Contractor
Aug 2
2 min read

Updated: Aug 5

In recent years, Chicago has faced serious challenges regarding air quality. According to the American Lung Association's 2024 Air Quality Report, the city received an "F" grade for its high levels of ozone and fine particulate matter (PM2.5) pollution. The Chicago metropolitan area ranks among the 25 most polluted cities in the U.S., with days where the air can be harmful to sensitive groups, such as children, the elderly, and people with respiratory illnesses.

Chicago Quality air alert — The Chicago area is under an air quality alert until Friday night due to the Canadian wildfire smoke

How Can Sustainable Construction Help?

One of the most effective solutions to mitigate this problem is the integration of green roofs and vertical gardens into residential and commercial buildings. These structures not only beautify spaces but also:

✅ Filter pollutants: Plants absorb CO₂ and harmful particles (PM2.5 and PM10), improving air quality. A University of Illinois study estimates that 1 m² of green roof can remove up to 2 kg of pollutants per year.

✅ Reduce the "heat island" effect: Chicago suffers from high summer temperatures due to asphalt and concrete, which worsens pollution. Green roofs can lower building temperatures by up to 30°F, reducing the need for air conditioning and, consequently, CO₂ emissions.

✅ Manage stormwater: In a city with frequent flooding like Chicago, green roofs absorb up to 75% of rainwater, preventing it from carrying pollutants into rivers and lakes.

Chicago Is Already Taking Action (Green Roof)

The city has incentivized green roofs with programs like "Chicago Green Roofs," which since 2001 has installed over 5.5 million square feet of eco-friendly roofs on public and private buildings. The famous City Hall is a great example, with a green roof that reduces its energy consumption by 10% annually.