| http://www.w3.org/ns/prov#value | - Such greenery can reduce levels of nitrogen dioxide (NO2) and microscopic particulate matter (PM), two potentially harmful pollutants, by 8 times more than previously estimated.NO2 and PM levels often exceed safe levels in cities, explained Thomas Pugh Lancaster University in a press release, but previous work has suggested that trees and other plants remove some of those pollutants, improving air
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