HT Ludhiana Live

Plants lower street pollution

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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%.

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