Plants reduce city street pollution 8 times more than thought
Washington: Trees, bushes and other greenery growing in the concrete-and-glass canyons of cities can reduce levels of two of the most worrisome air pollutants by eight times more than previously believed, a new study has revealed.
Thomas Pugh and colleagues explain that concentrations of nitrogen dioxide (NO2) and microscopic particulate matter (PM) — both of which can be harmful to human health — exceed safe levels on the streets of many cities.
Past research suggested that trees and other green plants could improve urban air quality by removing those pollutants from the air.
However, the improvement seemed to be small, a reduction of less than 5 percent.
The new study sought a better understanding of the effects of green plants in the sometimes stagnant air of city streets, which the authors term “urban street canyons.”
The study concluded that judicious placement of grass, climbing ivy and other plants in urban canyons can reduce the concentration at street level of NO2 by as much as 40 percent and PM by 60 percent, much more than previously believed.
The authors even suggest building plant-covered “green billboards” in these urban canyons to increase the amount of foliage. Trees were also shown to be effective, but only if care is taken to avoid trapping pollutants beneath their crowns.
The study appears in the ACS journal Environmental Science and Technology.
More from India
More from World
More from Sports
More from Entertaiment
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar Part II
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar Part III
- Panel discussion over Lalu Yadav's insensitive attitude over flood situations in Bihar Part IV
- Olympic bronze medallist Sakshi Malik returns home from Rio to grand welcome!
- Suspended AAP MP Dharamvira Gandhi floats new front
- Now, get your email address in Hindi
- None of your concern, says Indian Army after China's warning over deployment of BrahMos missile in Arunachal
- PHOTOS: BRUTAL! Randy Orton receives 10 staples after Brock Lesnar's assault at SummerSlam
- Army Chief Gen Dalbir Singh Suhag appeals for peace in Kashmir