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Green roofs could reduce indoor air pollution

Date:
April 10, 2019
Source:
Portland State University
Summary:
Green roofs -- roofs that are planted with vegetation -- may improve the indoor air quality of commercial buildings by cutting the amount of ozone coming into the buildings from the outside, according to new research.
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Green roofs -- roofs that are planted with vegetation -- may improve the indoor air quality of commercial buildings by cutting the amount of ozone coming into the buildings from the outside, according to new research from Portland State University.

The findings add to the already known environmental benefits of green roofs, including reducing carbon dioxide, decreasing storm water runoff and cutting down on urban heat, according to PSU researchers.

The researchers from PSU's departments of Mechanical and Materials Engineering, Biology and the university's Honors College, set up measuring devices on the roof of a big-box retail store in North Portland that was split between a green roof and a more conventional white membrane roof.

They measured the air coming into the building from outdoor intake vents, and found that the air coming in from the green roof area had modestly lower ozone levels than the air coming in from the unplanted area. They found that the vegetation trapped and filtered the ozone in the outdoor air.

The trapping effect is a process known as dry deposition, in which airborne particles collect or deposit themselves on solid surfaces. It's a natural process that is key to removing pollutants from the atmosphere.

The study was conducted over a two-day period. The authors said the findings warrant a longer-term study -- one that could include measuring other pollutants as well as ozone.


Story Source:

Materials provided by Portland State University. Note: Content may be edited for style and length.


Journal Reference:

  1. Pradeep Ramasubramanian, Olyssa Starry, Todd Rosenstiel, Elliott T. Gall. Pilot study on the impact of green roofs on ozone levels near building ventilation air supply. Building and Environment, 2019; 151: 43 DOI: 10.1016/j.buildenv.2019.01.023

Cite This Page:

Portland State University. "Green roofs could reduce indoor air pollution." ScienceDaily. ScienceDaily, 10 April 2019. <www.sciencedaily.com/releases/2019/04/190410090331.htm>.
Portland State University. (2019, April 10). Green roofs could reduce indoor air pollution. ScienceDaily. Retrieved April 22, 2024 from www.sciencedaily.com/releases/2019/04/190410090331.htm
Portland State University. "Green roofs could reduce indoor air pollution." ScienceDaily. www.sciencedaily.com/releases/2019/04/190410090331.htm (accessed April 22, 2024).

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