Green roofs – roofs that are planted with vegetation – can improve the indoor air quality of commercial buildings, reducing the amount of ozone that enters buildings from the outside, according to a new research from the State University of Portland.
The results add to the already known environmental benefits of green roofs, including the reduction of carbon dioxide, the decrease in runoff from stormwater and the reduction of urban heat, according to researchers at the PSU.
Researchers from the departments of Mechanical and Material Engineering at PSU, Biology and Honors College of the University have established measurement devices on the roof of a retail store in North Portland, divided between a green roof and a more conventional white membrane ceiling.
They measured the air that entered the building by means of open air ventilation, and found that the air that came from the green area of the roof had lower ozone levels than air from the non-implanted area. They found that the vegetation trapped and filtered ozone in the outer air.
The trap effect is a process known as dry deposition, in which airborne particles are collected or deposited on solid surfaces. It is a natural process that is essential to eliminate contaminants from the atmosphere.
The study was conducted over a period of two days. The authors said the results justify a long-term study, which could include the measurement of other pollutants and also ozone.
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