A new study has found that green roofs do a lot
more than just provide extra space to grow plants. These
eco-friendly roofs can also enhance air quality inside of
buildings by reducing the ozone levels that come in from the
Scientists at Portland State University conducted the study at a
large commercial building in Portland. Researchers installed
devices on the roof, which was split between a traditional membrane
and a green roof. The devices measured ozone levels of the air
surrounding the building. They discovered that plants on the roof
helped to trap ozone, preventing it from coming into the
The new study adds to the growing list of green roof benefits.
Phys.org, this includes the ability to filter carbon dioxide,
cut down on excess water runoff after big storms and reduce heat in
urban environments. Not to mention all of the veggies and plants that can be grown,
cultivated and even shared with the local community. But how does
the vegetation trap ozone and remove it from the air?
The process of trapping ozone is called dry deposition, where
particles in the air accumulate on solid surfaces. The process of
dry deposition is completely natural and has been proven to be an
effective way of filtering air. Prior to the new research, however,
scientists did not know that a green roof could actually improve
air quality indoors.
It should be noted that the study, which was published last
month in Building and Environment, only took place over a few days.
The scientists who led the research effort have admitted that more
studies that measure pollutants trapped
over a long period should be completed.
They also want to look at other pollutants other than just
ozone. Once this happens, we will better understand the broader
benefits of green roofs and just how much they can contribute to
better indoor air quality.
Source: FS – All – Ecology – News 2
Green roofs can improve air quality inside buildings