HT Ludhiana Live
Plants lower street pollution
Trees, bushes and other greenery in the concrete-and-glass canyons of cities can reduce levels of two most worrisome air pollutants by eight times more than previously believed, says a report in the ACS journal Environmental Science & Technology.
The concentrations of nitrogen dioxide (NO2) and particulate matter (PM) — both of which can be harmful to human health — exceed safe levels in many cities. 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% and PM by 60%. Past research suggested that trees and other green plants improved urban air quality by removing those pollutants from the air by about 5%.